SINGER 14T968DC Professional 5 Workbook Part 2 - Manual (Page 66)

6. Before threading the eye of the needle, make sure the thread is in front of
the thread guide located on the bottom of the needle clamp for the Cover
Stitch or Chainstitch.
7. Thread the eye of the middle needle .
8. Draw about 4 inches of the thread through the needle eye towards the back
of the machine.
9. Place the thread to the back, under the Presser Foot. Lower foot and sew.
Five-Thread Safety Stitch Narrow page 16