The license credentials are for here at xenforo.com. They are completely unrelated to logging into your own forum. On your own forum, if you don't know what password you set when you installed it, do as Brogan said and use the lost password function. The password to login to your admin control panel is the same as to log in to your forum.Yes. I would love to change my forums /admin.php login. I cant login with licence credentials.
edit: there are no lost password tabs in /admin.php page.