The Prompt bar is located along the bottom of the work area.
In the case of a run stitch line the entry/start and exit/end point should be at the same location, if you wish to have 2 passes of stitching everywhere this will create a runs stitch out and one back so each line of stitching is duplicated on the backtrack to the end point.
If it does not matter that some parts or the design have two runs and others three then the start and end points can be at separate locations.
The start and end points can be moved, with the reshape tool, to any suitable location even after the branching has been completed. The software will re-path automatically to accommodate the new location.