By hand you can now adjust the positioning of the stem and handlebar so that is in line with the front wheel of the bike.

Tighten the two bolts; [I] and [II] with a 7/32" Allen Wrench . These clamp the stem to the steerer tube of the fork.

Make sure that after tightening bolt [II] you go back and make sure you check the tightness of bolt [I] again. Since the bolts are used to clamp, bolt I will usually not be tight enough after tightening bolt [II].