How do you do box gimp?

u start out with 2 pieces of gimp then u put one on top of another to make it look like a plus sign then take the bottom string and fold it over the top string once on on each side ( u might want to leave the fold loose like not really tight)then take ur other string and do this step on both sides take the first gimp piece u wanna use and weave it through ur two folds go over the first fold and under the second then tighten it u should start out tightening it loosely then really tight after that you just have to keep doing the last 2 steps over and over again until you finish