Step 1-> Login to Grey Market and click on (Username) Settings link on the top-bar.
Step 2-> Click on PGP.
Step 3-> Click on Setup.
Step 4-> Copy your PGP key and paste on this page (Don’t have a PGP key? Here’s how to complete all the above steps, and create a PGP key using Kleopatra).
Step 5-> Finally just click on “Turn On”. Done. You’ve turned on 2-FA for your account.