To create an account for the calibration, you need to have access to the VM. Once here, just type the following command :
sudo htpasswd /home/gazelle/gazelle-calibration/html/htpasswd.users <username>
You will be ask to create your password.
To access the calibration, go to the admin.php page. Once here, click on the Gazelle Calibration link in the Utilities section and sign-in. This page is rather self-explanatory.
By clicking on the date, you can view the details of an execution.
Go back to the admin.php page.
Beside each tool there is an icon indicating the calibration result :
You can click on the icon to go to the right section of the last calibration report.