@kms5283 Hi there! I start the keychains with a lark's head knot. Essentially, fold the string in half and put the loop on one side of the bar of the key chain, and then thread the ends of the string through the loop so that it ties onto the bar.
I hope that makes sense 🙂 Google "lark's head knot" for a video tutorial.
The threads are doubled up using the lark's knot, so the key chain is a bit wider/thicker than it would be when making a bracelet.