There seems to have been a lot of drama, false claims of "hacking", and vandalism here.
The only way someone can mess with your account is if they guess or are given your password. So choose a secure one, and never, never share it with anyone.
The only way someone can mess with the wiki is by vandalising it (making bad edits) or using admin tools to change things maliciously (which is what happened to the background).
In both cases, things can be fixed easily. I've already fixed the background (you may need to refresh to see it).
I've taken admin rights away from all the new admins. Those rights should not be replaced unless the community fully trusts them not to use the admin tools badly. I've also banned VampireMaster123 for the malicious background change.
I am prepared to ban anyone who threatens to "hack" or "take over accounts" or anything similar. This has to stop.