Hi odmejsss, I have checked the FFT game database and your account is already an id.net account.
You can change the password for id.net login from https://www.id.net/accounts/password/new
You will need the email address you registered for id.net. The one in the game database is firstname.lastname@example.org
Note: that email looks like it was typed in incorrectly (gamil), if you want to change it then contact id.net support and they will help you with that. If you do change the email you will need to contact me again so I can fix it in the database too.