The rim around the headlight is snapped on. Grab is at the bottom
with your fingers and pull forward, it will snap off.
Then unbolt the mirrors, then remove 4 screws from the bottom of the
headset that hold the top 1/2 on. Now you can access the bulb from
the rear of the head light.
You can use a 55 watt in place of the 35 watt. They are available
at automotive stores. Take you old one with you. I'm not sure of
the numerical designation.