If you have springs on the front suspension, you do not have torsion bars.
That being said, you crank on a bolt inside the mounting (third pic shows the mounting best) at the rear of the bar. The bolt is offset from the centerline of the bar (to the outside, I think), and the bolt changes the position of a key attached to the bar. Some key bolts have a lock nut on them. You have to look into one of the holes in the mounting. Use lots of lube, and make sure the tires are off the ground when you crank.
Cranking them will cause toe out, and camber change. You will need an alignment after you crank them.