It's a "truckish" procedure but simple. Just use a #2 Philips screwdriver to remove the screws around the perimeter of the lens then gently pull the assembly out using your fingertips at the edges. Once out just twist and remove the receptacle for the failed bulb, remove and replace the bulb. Have someone step on the pedal (or turn on the lights) to test before replacing (in case something failed other than a bulb) then reverse procedure to replace. Careful not to over-tighten the screws as they can strip or crack the lens.