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.