JVC DIAMOND DM65USR User Manual page 48

Launch Roku App
Press key anytime when TV is on and Roku streaming stick is plugged into
the Input button and select "Roku" on the input source.
the TV, or
Roku App
Roku Remote Control Operation Instructions
RW button: Rewind, scroll left one page at a time.
Play/Pause button: Start or pause playback.
FF button: Fast Forward, scroll right one page at a time.
Back button: Return to previous screen.
Roku Home button: Return to Roku home screen.
Info* button: View more options
Directional buttons: Move up, down, left or right.
OK button: Select an option from a menu.
Instant Replay button: Replay last 10 seconds of video.
(Note: Qwerty Keyboard and touchpad does not support Roku.)