Your client can access their Favorite Lists at any time simply by clicking on the heart icon at the top right corner when viewing their Gallery:
If they have been logged out of their session, they may need to re-enter the email address that they used to create the Favorite List:
After logging in, they will see all of the Favorite lists created under that email address, and they can then click into a list to view the images:
From here, clients can View, Share, Download, or Add Notes to the images, if these options are enabled.