Join Date: Nov 2000
Location: New Orleans, LA
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Are you able to move the shifter? If so, when you move it, does the cable tighten and slacken. If the shifter moves and the cable tightens and slackens appropriately the derailleur mechanism may just need to be cleaned an lubricated. Disconnect the cable and see if you can move the cable with your hands.
If the shifter moves but there doesn't seem to be any effect on the cable there may be a problem with the shifter.
If they bike is new let the bike shop check it.
If you don't know how to do any of the above you need to get a book. Derailleur adjustment is something you really need do learn how to do correctly. There have been numerous threads on book suggestions.
If it ain't broke, mess with it anyway!