Use a spudger to lift up the circuit board from the bottom until it loosens from the body.

Use the thin end of a spudger to lift up the back of the indicated connector until it comes free. The connector pivots at the tip so it's necessary to lift it from the back.

The connector may require some force before it comes free. Tilting the circuit board to apply pressure may be helpful here. Be careful not to damage the wires leading to the connector.

The circuit board should now be completely detach from the body. Set it aside.