How to open the ring? The super easy way is to get a jump ring tool from a bead store. It looks like a ring that you put on your non-dominant hand. I pick up a ring with my pliers, put it in the slot on the jump ring tool, and then move the top of the ring to the side with my pliers. You can close the ring the same way.
So you can see it. There is a tut and video, too. Jumpring tool, silver colored brass, opener and closer. Sold per pkg of 10. - Fire Mountain Gems and Beads