You can add a Blink to your favorites in two ways:
1. From the 'For You' screen, navigate to your library.
2. Tap on 'Saved', 'Finished' or 'Downloads' to find the desired title.
3. Tap on the 3 dots next to the Blink you would like to add as a favorite.
4. Select 'Add to Favorites'.
When you finish a title you can scroll to the bottom of the 'Final summary' page and add it to your favorites from there by clicking on the heart next to 'Favorite it'.
Please note: this feature is not available for Shortcasts or Audiobooks.