I thought the guy at powersteering.com had this up on his web site, but I can't find it right now.
The procedure is:
Center the steering wheel (engine off)
Fill the pump reservoir according to the dipstick.
Start the engine without moving the steering wheel, let it run a few seconds, shut it back down.
Check fluid, refill
When starting the engine and running it no longer causes the fluid level in the pump to drop, proceed to next "phase".
Start engine, turn the wheel 1/8 turn in each direction, center wheel, shut it back down.
Keep repeating the procedure - when you don't have to add fluid, start turning the wheel farther.
When you work your way up to the point where you can turn the wheel "lock to lock" without the fluid level dropping any, you're done.