Trim wire end. Measure out how much cup chain you think you'll need. I used 3.5" for the ring size memory wire. Hold the cup chain end on top of the earring and wrap the wire around the earring and gap between the first and second cup 1.5 times.
Pro Tip: You can position the cup chain to face the front of the earring (which is what I did in this DIY) and you will have an obvious earring front and back. Or the cup chain can be positioned around the earring wire outside of the earring facing out.