See if this helps:
Lines command – Draws x or y lines at specific x and y locations.
Connect command – Draw a line between two or more (x, y) locations
Region command – Draws ovals or rectangles over a region
Label command – Draws a line to an (x, y) point. By default has an arrow at the end, but you change this to just be a line, with or without a label at the end.
The Lines and Connect are data driven, so you have to specify where in x y coordinates.
The Region and the Label are interactive and draggable on the graph.
There is also the Freehand command that is in the beta.