Board Thread:Support Requests - Getting Technical/@comment-24553580-20151010043724/@comment-25428589-20151010055547

Hey, you can't install extensions. You need to ask staff to install them via Special:Contact/general.

However, with regards to the variable extension, is this the one you're talking about? If so, all Wikia wikis already have it. - Edit: I'm an idiot, see below :)