There are three ways to add words or sentences to your list of Favorites.
• The first method is to:
1. Go to the "You" tab.
2. Tap on "Favorites". 
3. Tap on the group to which you want to add words or sentences.
4. Tap the "Add" button. 
5. Select words or sentences from the list. You can also use the Search or Filter.
6. Tap the "Add" button.
• The second method is to tap the Favorites icon (star) straight from the Vocabulary.
• The third method is to tap the Favorites icon (star) from the Search features.
Note: You can add up to 100 words and 100 sentences to any group of Favorites.
The words or sentences added by the second or third method will be be automatically added to the default "My Favorites" group.
At this point in time, the Favorites feature is available only upon Paid Subscription and only on Android devices.
You can also watch our video tutorial on how to add favorite words or sentences here.
How do I subscribe?
How do I delete favorite words or sentences? (Android only)
How do I create a favorite group? (Android only)