After loading the mobile phonebook, press the Favorites button on the touchscreen, and then press one of the +Add Favorite Contact buttons that appears on the list.
After loading the mobile phonebook, select “Contacts” from the Phone main screen, and then select the appropriate number. Press the Down Arrow button or the Settings Gear button next to the selected number to display the option’s pop-up. In the pop-up, select “Add to Favorites”.
If the Favorites list is full, you will be asked to remove an existing favorite.