pull the yellow dust cover off the center of the wheel, then you'll have to pop the lock ring loose that holds the wheel on the shaft. Careful, there is a metal spline that will come out with the wheel when you pull it off, and you will need to line it back up when you replace the wheel. Then simply take the wheel to a local tire storeand have it replaced. Re- install the wheel same way it was removed, remembering to line up the small metal spline.
Jeff, October 2008