Step 1:
In order to change the recipient on a Registration first select the Registration from the Registrations index page and select the Registration you would like to change.
Step 2:
Next select Edit All on the Registration you would like to change.
Step 3:
Next change the Recipient in the Recipient drop down.
Step 4:
Next select Save All to save your change to the Recipient.
Step 5:
Here is the Registration shown with the new Recipient.