Fisherman's Rib
Reference for the below knit kit:

Thread your end through the embroidery needle.

Bring the embroidery needle perpendicular through the nearest "V" and bring your thread through. 

Continue threading the embroidery needle through the V's from left to right.

Once you've threaded the yarn through a few "V's", go the opposite way (in this case down) back through the "V's" that you went up.

Once you have gone through a few more "V's", trim the remaining yarn - you're finished!