User blog comment:Guardian Assassin/testing/@comment-2121369-20110430012642/@comment-2121369-20110501002540

Ahah. Well, you can take that statement back about not being good at wiki-ing if you want, because this testing area feature is really just a page inside a page.. it's not special Wikia coding or anything, and hardly anyone knows about these "sandboxes".
Anyway, the links (there are no buttons, other special methods installed by Wikia):
http://assassinscreed.wikia.com/wiki/User:Guardian_Assassin <-- Is the link to your mainpage
http://assassinscreed.wikia.com/wiki/User:Guardian_Assassin/Sandbox <-- Is the link to your testing area.
http://assassinscreed.wikia.com/wiki/User:Guardian_Assassin/Gallery <-- Maybe even a page filled with images that you favor?
You can even create your own by simply adding a "/Pagename" at the end of your userpage link and browsing to it (obviously substituting "pagename" for your desired page name). Hope this tutorial helped out a bit, happy editing!