When your Shared Service Alliance or Enterprise send you a code, copy the code and login to your Playground Admin Dashboard. Click on the Settings tab on the left hand side. Scroll all the way to the bottom of the General Settings tab. Paste the code into the Connect to an organization field and click "Save". Your Shared service or Enterprise administrator should now see you on their dashboard.
If your Shared Service or enterprise admin have not sent you a code yet, please send them THESE instructions.