Use a lighter and burn the end of the cord and flatten it so the string inside doesn't come out.
Measure 8 feet of cord. (If you are doing two colors, measure 4 feet of each and burn the ends together so it is about 8 feet long, but still using the same method).
Get a relatively small buckle and grip the two ends together and put them through the buckle together.
Pull the cord through, but leave a small loop at the end to put the cord through. Once you have done that, pull it so it is tight.
Put the other buckle on and wrap it around your wrist leaving space.
It is hard to put into words so do what the photos show. What I can tell you is to, on the end going down, wrap it over and inside the "loop" you see.
Continue to do that, but on the other side each time.
When you reach the end, cut the excess cord leaving a tiny bit of cord, and after that, melt it with the orange part of the flame.