Start by applying E6000 adhesive to the post on the glue-in cap. You will want enough adhesive for the post to make good contact with the glass bead, but not so much that it oozes out the sides of the bead and cap.
Insert the cap post into the Murano glass bead.
Prop the bead upright. Allow the adhesive to dry according to the manufacturer's recommendations before gluing the other end of the bead.