how do i replace the windshield washer pump

First did you turn the ignition on with out starting the car and check if you can hear the pump motor working,you should be able to hear a mechanical whirring sound, check the fuse, loose wires attached to the pump, the hoses from the pump to the delivery system at the bottom of your windshield not clogged? Do you have fluid in the resovoir? Check these before anything else. Assuming you have done all these checks replacing the motor is not that big of deal.