1993 Pontiac Bonneville One wheel turns.

I have always done my own work and have never had to do anything suspension or steering related so I am new to this. I was at a stop sign tonight, pulled off making a left and something popped. I got out and my driver's side wheel wouldn't turn. I am assuming it's either a tie rod end or the steering knuckle. I just want a little insight since I have never dealt with this before. The driver's wheel was completely free as if it became unattached from the steering. Thanks