You can change the password via the UI or by using a CLI.
Via the UI:
Login to Hyperglance as an Admin user, select the Hamburger icon and then the 'Tools' menu, click on the Change Password option.
On the Change Password dialog select the user whose password you wish to change (e.g. for the 'admin' user) and enter a new password:
Via the CLI:
Connect/SSH to the Hyperglance server
Run the following command:
When prompted for a password enter the new password you wish to use. (You will be prompted twice and the password must match both times!)