How to route trace?(branch)
Hit a pin, and click F3 Start_Stub.
The following softkeys become available.
This is three routing mode. When F5_Disable_Branch mode is selected, it is not possible to create a branch to another trace, but trace to another pin can be created. F6 button allows connection to a segment of another trace. F7 button allows connection to a vertex or a via of another trace.
More useful info
In the drag mode, if you right-click, dragging will be stopped and the last vertex of the copper trace will be highlighted.
You can move it on vertex of another copper trace (on same net) to create a branch. To do this, press F4_Move_Vertex to start dragging.