While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Go to the main forum page, scroll down to Equipment Exchange. Right under the title is a "click here to request permission." It may take a day or so to get access, IIRC. Good luck with your sale, and welcome to CGN.