If you purchased your subscriptions from an Acronis partner, you should have received an e-mail confirming the registration codes for each subscription. Go to your account management webpage, click Enter new registration code, and then enter the registration codes. The subscriptions will appear in the list of available subscriptions on the Manage subscriptions tab.
Another way to register the subscriptions is to enter the registration codes during local installation of Acronis Backup in Windows.
Subscriptions that are purchased from the Acronis website are available on this tab immediately.