Use Insert Points 
 to add new points to the currently selected line of ribbon or decorations. 
Select the desired line of ribbon or decorations, then click Insert Points
. The pointer changes to the plus pointer
  . Click to add a point to the line. Right-click to finish adding points.
Hold down Ctrl to place a straight line or corner point. Click Undo
to remove the new point.
Shortcuts
Edit Embellishment, Embellish Tab:
Keys: Alt, D, R