Then, navigate to the JetApps client area with the following link:
Or, once logged in, click on the Services > My Services tab to find your JetBackup WHMCS module service with its corresponding license key.
Now login to your own WHMCS billing system (where the JetBackup module is installed) as the admin user and navigate to “Setup” → “Addon Modules”.
Select “configure” next to the JetBackup module and enter your license key you retrieved from the JetApps client area.
Select “Activate” if it is not already selected for the module.