Based on the rust on your bars I'd say your stem might be seized. That's the part coming out of the headtube and making an angle to the clamp where your bars are held.

There should be a bolt right where the stem begins to angle. Loosen that, see if you can move your stem. If you can, pull it out. As for getting the bars out, you took a picture of the bolt that loosens the clamp. Loosen that, removes bars.