Edit Crosses, Backstitch and French Knots
Draw Color and Erase
Use the pop-up palette in the Thread Color area of the Create window 
to select a drawing color. Click the Erase 
button, or press the Option ⌥ key when erasing stitches of the selected type.
Edit Crosses
Use any type of cross to replace and erase any other type of cross. When drawing full crosses, they will replace or erase any combination of small or part crosses in a grid square. When drawing any other size of cross, they will replace or erase according to their size and shape. Crosses can be drawn, replaced and erased by single clicks or by dragging.
Edit Backstitch
Standard and freehand backstitch are edited separately.
Standard backstitch replaces existing standard backstitch if it is drawn in the same place. Standard backstitch can be drawn, replaced and erased by single clicks or dragging.
Freehand backstitch will only replace existing freehand backstitch if it is drawn with exactly the same end points. If either end point is different, a new line of freehand backstitch is added. Freehand backstitch is drawn and replaced one line at a time when dragging, and erased one line at a time with single clicks.
Edit French Knots
French knots are drawn, replaced and erased individually with single clicks. Only one French knot can exist at each half grid point.