I am trying to install a Peartune PT-MSO-4.0-B2 on my Bosch Performance Line Speed motor with COBI display. I can't figure out how to activate it. The directions say either 1 or 2 short or long presses of Light button( I have no idea where that is), Walk button, or + or - buttons.(could that be any vaguer?). Nothing works. I contacted the folks at Pear but who knows how long it may take to get a response. Anyone have any ideas?