*note- SCAL4 pro used.
1- Open SCAL4 software.
2- Create your shape or add a design.
3- On the left size of your toolbar, select the pen tool.
4- The pen tool will appear on your screen. You will see that there is a little X next to the pen icon. When the X is there you cannot add or remove a node from the design.
5- Hover the pen tool over the edge of your design till there is a + sign instead of the X. THen you can click and add a node on your design.
6- To remove a node hover over where the node is until there is a - symbol then click. the node will be removed.
You can repeat this as many times as you need to add and remove nodes in your design.