How do you get a window crank off a 91 Pontiac sunbird?

There is a snap ring that fits onto the handle itself. A flat screw driver, steel ruler or similar "tool" slid between the handle and door liner will allow you to release the snap ring from the shaft that holds it onto the handle. Looking at the handle with the knob to the right, the ring slides off to the left. Chilton book #28320 Page 10-13 Fig. 43 gives a good picture. Hope this helps.