This method assumes that your headlight is aimed properly.Park on a level surface with your bike on its service stand about 20 feet from a garage door or wall. Decide whether you want your PIAAs to supplement your high beam or low beam. To aim with the low beam, turn on your headlight and aim one lamp at a time. Cover or unplug the right lamp, and aim the left one so that its spot appears on the wall directly to the left of the headlight's main spot, with the PIAA spot just next to the headlight spot (the main light patterns should be touching). Then, uncover or plug in the right lamp and aim it the same way, but to the right of the headlight spot.
If you are aiming with the high beam, the method is similar, but you may find that you will want to overlap the spots of the PIAAs with your headlight by about 50% to give more light farther down the road.
You will need to make adjustments based on a test ride, but this method will usually get you pretty close.