To share your Lens, you must first publish your Lens. After you have published your Lens and its status is Live, share your Snapcode with your friends. Once your friends open the Lens with Snapchat, they can select the information button and Pin To Spectacles.
The Lens will show up on the left side of their Spectacles (2021) carousel with the icon the next time they put on the device.
Illustrative of Spectacles field of view