In the event you forget the server admin password, need to reset it, or simply want a new one, you'll want to follow this guide.
First, start by going to your server's game panel. This will be the same place you can start, stop or restart your server.
Once here, find the "Change Admin Password" button on the left-hand side. It'll be pictured with a Lock icon. Click this button to continue.
When prompted, you should be able to see your current password and also enter a new one if desired. If you enter a new one, click "Run" to apply the changes.
The script will now execute. When it is finished, your server should be good to go with your new password!