The clip is useful for ensuring your hearing instrument doesn't fall off and get lost, and the o-rings can help keep your hearing instrument closer to your head and tidy up the cords.
After you have installed the Ear Gear onto your hearing aids, open the clip by pulling up on the tab. Attach the clip by pressing down.
Put your hearing aids on and attach the clip to the back of your shirt. You have the option of using the O-ring by sliding it on the cords toward your head. Using the o-ring will keep your hearing aids closer to your head and streamline the cords.
For more info, check out this video.