To flag a contact as a favorite:
1) Enter the contact record.
2) Press the star icon in the upper right part of the screen.
The contact will then be placed in the Favorite group, and a yellow star will appear in the contact record and next to the contact's name in the "My Contacts" list.
To flag multiple contacts as favorites:
Press the + icon in the lower right corner of the My Contact list and then Press Select Contacts.
Press the contacts you wish to select.
Once you have selected the contacts, press the ... button in the lower left corner and press Favorite to add them to the favorite group.
To remove a contact from the Favorite group:
Enter the contact record.
Press the star icon in the upper-right part of the screen.