Hi so I tried to change my username on "Special:UserRenameTool" but every time I try do a new username it always says "Wrong password. You must provide the current password." I typed in my password correctly a few times, and it still gives me the same old error that I recieved for last two and half hours. Now I don't know if it's just my google account that's connected to my Wiki Fandom account and that the password can't be changed because of it. Even if I typed in my password that my google account has it still gave me that error and it's getting really frustating for me.
If you created the account linked to Google, it doesn't recognize your password because as far as Fandom is concerned, you don't have one. Complete the ForgotPassword flow and you should be able to rename.