Use Add Color Change 
to select a new thread color. The new thread color is usually added at the end of the embroidery, ready for drawing stitches in the new color. However, when Insert Mode 
is highlighted, and a stitch point is selected, the thread color is inserted at the selected stitch point. This will change the color of a section of stitches that is already in the embroidery. You may also draw stitches in the new color from that point.
Click the Add Color Change icon 
and the Color Selection dialog box appears. Select the desired thread color and click OK. The new thread color is added to the color worksheet.
Shortcuts
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Draw Toolbar:
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Keys: Alt, D, C