Gently push the bead into the cage, between the largest gap in the spiral.
Once inside, squeeze the cage closed slightly with your fingers, so that the ends line up perfectly.
Slide the bead round in the cage so that its hole lines up with each end of the cage.
Pro Tip: Insert a piece of scrap 24 gauge wire that is at least 3" long and bend around the caged bead, pushing the cage against the bead. Twist the scrap wire together to secure. This allows for any fine adjustments to the cage and keeps the hole in place ready to be used.