Gather everything you need so you don't need to look for anything later.
Stick the thinner ribbon onto the black ribbon, leaving a small gap in the middle for the pendant.
After the glue has dried, attatch these thingys to the end of the ribbon (I still can't remember what its called, sorry). Attatch the lobster clasp and jump ring to one end and just a jump ring to the other.
Attatch the key pendant in the middle and you're done.