This behaviour is to prevent Spam, the reason is simple:
You must have cookies enabled and a Fedora Account System (FAS) account to log in to Fedora Project Wiki. Additionally, due to spam edits, as of 2016-08 your account must have at least one non cla* group to be able to login and edit. See Join for information on groups to join and contribute to. to make a change in every wiki you should have to join at least in --> 1 non cla* group. <-- in another works you have to be a member in another group different to --> Signed CLA Group (user) <--
although, Why would you like to edit wiki???
Regards.,