Hi
Try these:
press 'ok' on handset, and 'ok' on front of set for 5 - 10 seconds, or,
'menu' on handset, and 'menu' on set for 10 seconds.
Use coloured buttons for different option screens, and when in one of those,
'enter' takes you to main screen, options are entered using the keypad.
navigate using ring/channel/volume buttons.
yellow button to sequence through test screens - 'ok' to store
Regards,
John