accounts

Hello otland community, I am editing my page again, I had an error and I reinstalled all znote, and I am finding many bugs, what I am trying to solve now is being able to register, when I create the account, I put the acc the pass the mail, and other data... when I put register, it stays...

Is there a way to delete (by some SQL script) the accounts that don't have players? If it's relevant information, I use Gesior.