Kenwood KDC-X997 Manual page 47

Basic operations
Pause and play a content
Press and hold [1/6].
Selecting a content
Press [E] or [F] button.
Forward 30 seconds a content
Press and hold [F].
Backward 15 seconds a content
Press and hold [E].
"Likes" current content
Press [R] button.
To unvote, press the button again.
"Dislikes" current content
Press [S] button.
To unvote, press the button again.
Notes
You can not perform the above operations depending on the selected station.