First you have to know what bumpsteer is. Does your car follow ruts or grooves in the road? Does it pull to one side or the other when you brake? Mine did both, but it doesn't now that I have the offset bushings!
To install you disconnect the steering shaft from the rack.
Unbolt the long bolts holding the rack to the "K" frame.
Take the long bolts out.
Pull the rack away from the "K" frame and pry the old bushings out,front and back.
Insert the new bushings with the offset hole at the 6 o' clock position.
Bolt everything back up,don't forget to reconnect the steering shaft!