Where is Add to favorites on info screen
Each TV show typically has 3 tabs on its main page: Series Info, Episodes, and Upcoming. You will find “Add to Favorites” on the “Series Info” tab. Movies don’t have an “Episodes” tab, for obvious reasons.
For TV Channels, you can add to favorites by clicking the star icon to the left of the channel number/logo in the Live TV Listings area (and a few other places as well).
Just to follow up on what Dan's describing with some screenshots... In the Stream app on iOS and Android, the buttons in the following screenshots would say Info; on the Stream Website, the same buttons are labeled Episodes and Movie Info:
These two buttons are one way to get to the show (or "entity") page. Another way is to tap a search result. Once you get to the show page, you'll want to be on the Movie Info or Series Info tab.
Hope that helps.