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This usually means the nut that holds the wiper arm on is not tight enough. If you pop the plastic cover up you should be able to access the nut. I believe it's 10mm, tighten the nut and then retry the wiper. This should solve the issue if the motor is working.
Please give it a try and let me know.
Sounds good Susan, I am thinking it's likely the wiper froze to the window after the car was washed. Of course I don't know where you live, but if it's cold and you turned the wiper on, it can actually happen. I also sent you a diagram to help.
Thought I would check in and see how you made out with this?