For Apple devices, your digital American Sailing membership card can be found in the wallet app.
If unable to find it in the wallet app, check in the 'Expired Passes' section at the bottom of your wallet. If the card has expired, simply tap on unhide to move it back to the front page of your wallet app. See more information on how to Manage your passes in Wallet on iPhone
For Android devices, consult the documentation for the wallet app you are using. Your digital American Sailing membership card may be in a subfolder, or an expired folder.