The hostname is the name of your server. It used to be the domain name or the server's entry point, but it doesn't make much sense for many people now because domains are no longer managed on the server with the hostname.
However, if you need to change the hostname for any reason, you can do so by following the step-by-step guide below.
Step 1: First, log in to the ServerAvatar Account.
Step 2: Click on the Dashboard button for the server you want to change the hostname for.
Step 3: In the left-hand sidebar of the server panel, click on Settings.
Step 4: Now, you will see the Settings form as shown in the image below.
Step 5: Change the Hostname, and then click on the Save button.