From JumpBox Documentation Wiki

Change Hostname or Public Address

When you first booted the JumpBox you assigned it a unique name on your network. By naming it something like "MyJumpBoxApp" you can more easily refer to it on your network and not worry about the IP address changing if you use DHCP. If you're hosting from a Mac, you can refer to it as "http://MyJumpBoxApp.local" and if hosting from a PC "http://MyJumpBoxApp." This sequence of instructions will show you how to set a new hostname once you've already completed the initial configuration steps. Note: A hostname can be at most 14 characters long.

1. Click the "Network" icon in the admin control panel.

2. Choose the "Hostname" tab.

3. Set the the hostname field to the name as you wish it to appear on your network and click "Save" to commit the change. You're done at this point if you only wanted to change the hostname.

Also see the Public Address page.