The addition of arcs (edges) into net is realized by marking the pencil tool icon on toolbar.
After that set the starting point and the ending point by clicking to the chosen components on the canvas. This action creates a new arc (edge) between a place and transition. If there is a curved arc needed, you have to place a control point between the starting and the ending point. You can display the properties by double clicking over the object of the arc.
Properties ID, Count are available for GPN and EvPN nets, but only the Count can be set. Rel. Place (related place), property d and Capacity can be edited and matters only for EvPN nets.