If we forget admin password and dont remember the email address used, so you are kind of stuck, so in that case you need to reset your password directly in database and it is not as simple in other system. Just run the following query with new password and all done.
UPDATE admin_user SET password=CONCAT(MD5(‘saltnewpassword‘), ‘:salt‘) WHERE username=’AdminUsername’;
salt: any character(or string)
username: admin(or if something else)
That’s it all done, now you can login using ‘newpassword’