To change the admin password of your sever you'll want to do the following:
1. On the control panel, go to the service you want to change the name of.
2. Go into the custom command line manager, and click on new
3. In the Admin Password box, type the new admin password of your server, and tick the box to the left
4. Give the command line a name in the Description box.
5. Press save, and then click select on the command line.
Now you can use your updated admin password!