ok, well lets get this sorted out
this will be much easier if you have atleast the front end of the frame on jack stands and the front tires off (less weight)
unbolt the upper mount, so you can disconnect and screw/unscrew the actualy trac bar.
to shift the axle towards the driver side, screw the trac bar to shorten it, pulling the axle to the drivers side
do the opposite to push it towards the passenger side.
once you have adjusted the trac bar the required amount, you'll then have to force the axle to that side so you can bolt the upper mount back to the frame.
this really isn't a difficult procedure, if you don't feel comfortable doing it, maybe grab a friend, or local member who can give you a hand and you can learn for next time.