After you get the handlebar cover panels open (see photos in the bleeding brakes post, mentioned by 'bigblue' above), unplug the headlight connector, slide off the rubber bulb cover, release the wire clip with a#2 Phillips screwdriver, remove the bulb.
Replace without touching glass of bulb with your bare fingers. Then clip (a bit fiddly), rubber cover and connector. Reassemble the panels, turn signals and mirrors.
While you are in there - it might be a good idea to at least top of the brake fluid reservoirs with new can of DOT 4 fluid....or bleed the system if it has been two years since fluid was renewed.
Ask questions if you need to - not many of us busy riding just now.
Stig