If you forget your Joomla admin password, you can reset again from PhpMyAdmin.
- Login to your cPanel, and go to phpMyAdmin
- Select your database and click xxx_users
- Click the Edit link of the user you wanted to reset password
- Replace Password to “21232f297a57a5a743894a0e4a801fc3” and click Go
- Now Login to your site backend with ‘admin‘ as username and password
- Don’t forget to change the password from backend.