To move the location of a shot you must first hold down left click on the shot you wish to move. You can then drag that node to the desired location. When you are happy with the new location, let go of the left click and the node will stay in that new position.
1. Hold down left click on desired shot.
2. Drag the node to the desired location.
3. Let go of left click and the shot location will have been successfully moved.
After successfully moving a shot, the distances of all the respective shots will be automatically calculated.