1. You need to have an account and be logged in to edit that page.
   
   2. Your account has to exist awhile before full privileges kick in. It discourages unscrupulous people from creating an account just to go vandalize protected stuff—Wikia's smart like that.
   
   I'm afraid I don't know exactly how long is long enough, but be patient. It's gonna be a while before we can get to know you well enough to decide about Permission, anyway. In fact, have you read the Permission article yet?
   
   ~Neshomeh

The Unclaimed Badfic, if I recall correctly, has been locked to anonymous people. All you have to do is log in to the wiki, and if you haven't, then it's very simple to sign up for an account.

Maybe just ask. From personal experience, only the Marquis de Sod is mean to newbies, so if you simply ask the person who claimed it to give it up, they might.

Of course, they are more likely to do so if you have Permission first.