Having registered your cloud on the DR dashboard the next step is to choose which HV zone(s) to enable for DRaaS. This is done from the details page for your cloud. To access this click on Clouds at the top of the dashboard page, then click the gear icon next to your cloud and choose View.
Click on Register new Hypervisor Zone. This will show you a list of all hypervisor zones found on your cloud. Choose the one you want to enabled (for the beta program you are limited to KVM HVs and DRaaS always requires Integrated Storage).
Click Next then on the next page choose which replication site you want to use. For the Beta OnApp is providing sites in Dallas and London. Now click Finish to complete the process. You can choose to replicate different HV zones to different locations, but each HV zone can only be replicated to a single location. Repeat this step for each HV zone that you want to enable for DRaaS.