The square stitch is one of the most basic lanyard stitches you can learn. In fact, the square (or box) stitch forms the base for many other more complex stitches. The key to starting a square lanyard is making sure to keep track of the lanyard strands and to keep them from twisting together.
Cut two lanyard strands so that they are about 14 times longer than the length you plan for your finished lanyard.
Hold both ends of the two lanyard strands between one thumb and forefinger, and run the other thumb and forefinger along the strands until you reach the folded over sections. These are the centers of the two lanyards.
Cross the lanyard strands at their centers, with one strand (Strand A) lying below the other (Strand B).
Flip one end of Strand A over Strand B to make a loop. Flip the other end of Strand A in the opposite direction over Strand B to make a second loop.
Weave one end of Strand B over the loop closer to it and under the loop farther from it. Then do the same with the other end of Strand B.
Grasp one end of Strand A and one end of Strand B in one hand, and grasp the remaining two strand ends in your other hand. Pull to tighten the starter square stitch.