2006 Chevrolet Cobalt "car roll back park 05" Questions

...car in N and let it roll forward or back for a few inches. Then when I try and put it in park I have to hit it forward to make sure it locks in Park. Then my key will turn all the way to pull it out. ...

...ROLL ,OVER YOU ,OR AWAY ,CHOCK A WHEEL OR TWO WITH SOME THING BLOCK OF WOOD BRICK MOTHER IN LAW YA GET MY DRIFT so stage one complete but error msg and drive selector still not moving step 2. go to ...