To access the back end of your Kartris site, go to:

[your site domain]/Admin/

You will need your username and password. Note that if you forget these details, it is not possible for anyone to recover them, since they are 'hashed' for security. Instead, they can only be reset.

If you have another user who has 'config' permissions in the back end, they can edit your login and create a new password for you. If you are the only admin, then you must either using the Data Tool to do the reset, or force your site to run the setup routine again, see @2.7. Forcing the install routine to run again.