Once you have purchased a Cloud Safe subscription, you can control it using your online control panel. Once logged in simply look for the Backup Service link in the top menu.
If you don't see this link, it may be because you're in a different subscription on your account (for example, your web hosting subscription).
To move to your Cloud Safe subscription, select it using the dropdown menu in the top right hand corner of your control panel.
Once the page reloads, you will see the link to configure your Cloud Safe service within the top menu bar.