Below is an example of a parallel force system with three forces.
To use: Click one of the vectors and it will turn green and glide to the beam. Click below the arrow to place it on the beam. Then enter the magnitude of the force. Positive forces will point down, positive will point up. When you have placed the three forces, click the moment center and place it as you did the forces. When you have placed all four objects, click “solve.”
Still a few bugs, use at your own risk!