For this demonstration I used the 2″ triangle loom. I photographed every row and the finished product. (I apologize for the stained fingernails; that happened while I was painting the yarn.)
The same instructions apply to the 4″ and 6″ triangle looms. The pin numbers will be different according to loom size.
Yardage requirements and L4 pin wrap measurements for each loom size are found in the Pin Wraps and Yardage tab at the top of this blog.
Secure yarn to loom (or you can leave it hanging loose). I tied a slip knot and looped it over a 1-2 edge pin near Cr1. Take yarn alongside 1-3 edge pins up to Cr3 and wrap two pins (#13 and #12).