Radio favorites
To save a radio station as a favorite:
Open the radio app from Home view or App view.
Tap the star 
next to the radio station you want to add to the list of favorite stations. The star becomes solid blue to indicate that the selection has been confirmed.
next to the radio station you want to add to the list of favorite stations. The star becomes solid blue to indicate that the selection has been confirmed.The radio station is added to the list of favorites.
To remove a radio station from the list of favorites, tap the star again. The blue color will disappear to confirm that the radio station has been removed from the list of favorites.
It is also possible to add and remove favorites from the Now-playing view, which can be accessed by expanding the Now-playing field to full-screen view.