You have two options: you can email your preferred username to cdo@kenyon.edu from your Kenyon email address, or you can log into Handshake, go to your account settings, and add a username in the blank "middle name" field of your account. This field is not used for any public-facing purpose in Handshake, only to serve as your Rewards Program username for the scorecard and leaderboards.
The scorecard typically syncs each morning, Mondays through Fridays. However, Big Interview and Just Ask data only syncs once a week, on Tuesdays. If your points still aren't showing up, you can come to the CDO and we can investigate to ensure your activity was properly logged by the relevant system.