Adjusting the Rear Derailleur

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Slide the chain cutting tool onto the desired link.
Align the push pin of the tool with the pin on the chain, and tighten the tool until the pin protrudes out the other side without falling all the way out.

Stop pushing the pin out when it is just held in by the outer link, so it doesn't fall all the way out. You will still be able to separate the links.
Repeat the previous step to take off sections of links.

Bolt the derailleur to the mounting tab with an Allen wrench.
Be careful not to over-tighten the steel bolt, as this can strip the aluminum mounting tab.

Shift the rear derailleur into the highest gear(smallest sprocket).
Align the rear guide sprocket of the derailleur with the highest gear (smallest sprocket), by tightening or loosening the screw labeled "H".

Shift the rear derailleur into the lowest gear (largest sprocket).
Align the rear guide sprocket of the derailleur with the lowest gear (largest sprocket), by tightening or loosening the screw labeled "L".

Shift the bike into the highest numbered gear.
Slide the cable through the barrel adjuster screw until the cable housing bottoms out.
Pull the slack out of the cable while clamping it down with the nut that is attached to the derailleur.

Fine tune the derailleur by tightening or loosening the barrel adjuster screw. Loosening this screw causes the derailleur to move slightly towards a larger sprocket, while tightening it moves the derailler towards a smaller sprocket.
Shift through each gear while pedaling. The derailleur should move the chain one gear over each time you shift up or down.
If the chain skips or makes noise when you are not shifting, use the barrel adjustment screw to fine tune the derailleur alignment.
Repeat the previous steps until the derailleur shifts smoothly and makes a minimal amount of noise.