(I'm an ASE Certified Technician) Are you putting it in gear and trying to drive? Does it it make any strange noises like grinding or clunking? Do the rear tires not move in drive as well as reverse? You've made sure that the emergency brake is off and there's nothing blocking the wheels from turning? If you said yes more than twice then you've got some issues. Could be anything from a stuck parking brake cable, damaged rear differential or axle or damage inside the transmission. I would need more info to narrow it down from there.