You can add any scanned item to your Favorites by simply tapping the favorite (star) icon on the upper right:
Once added you can remove items from your Favorites by either tapping the star icon again to unfavorite the item or by following these steps:
- Navigate to your Favorites tab under Add > Food > Favorites
- Tap to select the item you want to remove from your list
- Then simply tap the filled in star icon again to unfavorite