So the question is, will it not turn when you stomp on the tail pad? or does it not turn when you lean into the board?
Either way, this is an easy fix! If you aren't turning when you lean into the board, you need to loosen the kingpin nut on your trucks (http://www.veniceskateshop.com/pages/ska...). Turn the nut left using a socket wrench or a special skate tool.
If your wheels aren't spinning, and you are having trouble turning by the stomp pad, check the bearings! The bearings are the little metal doughnuts within your wheel. Did you get new bearings when you bought new wheels? If not, maybe get some new bearings.
Best of luck!!!