stupid question...how do I get the backseat out of dart?

Like RedFish said.....remove the bottom section first. Some are more stubborn than others. Sometime you need to really kick the seat bottom rearward while you lift slightly on the front edge. The seat back should have some bend over tabs holding the bottom of the seat back frame to the body. Straighten those and the seat back bottom should move forward and clear the tabs. At that point, the seat back should lift up off the upper anchors.