If you need to update participants relationship (e.g. because someone selected 'Peer' when really they meant 'Direct report'), you can:
1. Open the Feedback area for your project (from the menu on the left hand side)
2. Click the person you wish to update, and look at the list of their feedback providers:
3. Click on the drop-down arrow next to View and click Update relationship.
4. Change the relationship(s) as needed. You'll see a green confirmation when the update has been saved: