Board Thread:Wiki Operations Questions/@comment-26237907-20150325063732/@comment-1398253-20150328110752

Until 2013, we routinely semi-protected pages from unregistered editors. Then COPPA came in, a US law that requires websites to protect children. As a result, we no longer allow editing if you don't have an account (a decision made by Wikia rather than the admins here). Semi-protection actually also blocks newly registered users from editing, which I believe was your problem. All semi-protection should in fact be removed, as it doesn't serve a real purpose now.

If you're still finding that you cannot edit a page, then it's probably fully protected. If so, let us know and we can tell you why it's locked.