To add a net to a PCB:
1.Click on the Add→Add Net button in the menu.
2.Move the mouse so it is over a pad, via or track and the cursor will turn to a green tick.
3.Left-click when you see the green tick to start a net.
4.Now move the mouse. As you move it a yellow line will be drawn from the source pad, via or track.
5.When the cursor goes over a valid end point for the net, the cursor will turn into a green tick.
6.Left-click when you see the cursor turn to green tick. The net will then optimize itself.