Teo mentioned something about this wiki including every possible thing. In vanilla, all structures are not flammable, and in RoG, Most structures are flammable. So I think they should be added to both categories.
Also, surprisingly, I had the same schedule today.
Done, this is because the wiki's settings only allow at least auto-confirmed users to rename pages. This is to prevent trolls from simply creating an account and then vandalizing a page by renaming it.
Your account is new, so it hasn't been confirmed. Once your account is 4 days old and you have edited a few pages, your account will be automatically confirmed, and you can edit any "auto-confirmed" protected page on any wiki forever.