You can add a workplace to your favorites using either the app or the Web Portal.
In the App: Tap on My Jobs, go to Past, and tap on a job you completed at the facility you want to add. In the next window, select Rate Facility. Then tap on the heart-shaped icon next to Add to Favorites.
In the Web Portal: Click on the job post. Then click on the heart-shaped icon under the image of the health facility to add it to your favorites.