By "any other wikis", I assume you mean a bunch of wikis, not most of the thousands of wikis Fandom hosts. It looks like you are new. As such, I am guessing you joined to participate on wikis about popular games, anime, tv shows, movies or something like that. Because these wikis are about popular topics, they get a lot of traffic and can be large targets for vandalism. It prevent vandalism, these popular wikis often require users to be autoconfirmed before they can make any edits. Your account will become autoconfirmed 96 hours (4 days) after it was registered. At that time, you should be able to do much more on those wiki.