You may need to have a friend help you if this is complicated for you. Any friend that can work on a car, boat, motorcycle, atv, anything should be able to figure it out. Steering is a very simple system.
Make sure the cable is connected to the nozzle and bars on both ends. Make sure the cable is held properly to the hull in the pump, make sure the cable is properly held in the bracket by the bars. Make sure the cable is not broken. Make sure the nozzle is not broken.
Sounds like you have a bad cable or the bracket that holds the cable by the bars is broken.