If there aren't any admins around when someone is vandalising, you can ask Wikia's SpamTaskForce for assistance. Their contact details are listed on that page.
From that. The easiest method without installing anything, in my opinion, would be to use VSTF Wiki's IRC Channel.
Once on that site:
1) At the 'Gateway Login Form' at the bottom of the page, type in a Username. This can be almost anything, but it's recommended that you use your own Username.
2) Check that it's set to the '#wikia-vstf' Channel. This should be the default Channel, but I'm telling you just in case.
3) Fill in the 'reCAPTCHA' box, this is to prevent bots from spamming them.
4) Click the 'Connect' button.
5) Wait for everything to load, then at the bottom, type in your message and click 'Say'.
Then if all goes well, a member of the VSTF should Block them fairly quickly.
Note that it is recommended that you give them a few chances (e.g. 3) and if they continue to do so, then use the above method.
Making Your Userpage Look Nice
Introduction
To prevent annoying other members (well, the ones why use the 'Recent Changes' page a lot), you should use the 'Preview' Button when testing out what a minor change does, and before saving your page.
This button can be found next to the 'Publish' button, and surprisingly, quite a lot of people don't see it and do like 20 edits in a row, cluttering/shortening the recent changes list.
That being said, almost everything you need to know for doing this can be found Here.
Other Tips
Stuff that weren't in the above link will be added here.
This is editable of course. Here's what you can edit:
Simple Page Border
Border-Style
What it Gives You
border-style: dotted;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: dashed;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: solid;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: double;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: groove;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: ridge;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: inset;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
border-style: outset;
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
The border-width and border-color are straight forward.
The bigger the border-width, the thicker the border.
Simplest one. Leaving the search condition as is, searches that condition.
[[Medium::TCG||OCG]]
Don't use this. It's been superseded and it also doesn't work any more. If you see this being used somewhere, it probably doesn't work, so replace [[Medium::TCG||OCG]] with [[Class 1::Official]], it's supposed to do the same thing, except it actually works.
Adding ">" in front of the condition, means "greater than or equal to". Generally, this is the one we use (but for the sake of completeness, adding ">>" means "greater than but not equal to".
[[ATK::<3000]]
Adding "<" in front of the condition, means "less than or equal to".
[[ATK::!4000]]
[[?ATK::?]]
This special one is used to find monsters with "?" ATK.
It's supposed to be just [[Card type::Effect Monster]], but just add the extra bit to be on the safe side, since it used to be the other one, and some cards may not be updated yet or the cache hasn't reloaded them properly yet.
[[Actions::Negates activation of Effect Monsters]]
[[Actions::Distributes A-Counter(s)]]
[[Actions::Changes battle positions]]
[[Actions::You draw cards]]
[[Actions::Flips itself face-down]]
[[Actions::Cannot be destroyed by battle]]
[[Actions::Changes control]]
[[Actions::Returns from your Graveyard to your hand]]