First, I take out the stitching for a few inches where the join will be. At the two places where I'm going to cut the cord so that the ends will meet, I apply fray check and let it dry; then I cut the ends so they just meet and with a needle and thread, sew back and forth a few times to hold them together. Then I turn under one end of the fabric so that it will cover the the other end and re-sew the fabric around the cord.
Looking back at that, it isn't very clear, although it isn't really complicated or very time consuming. Hope these pics help:
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Daffy