If you haven’t already, you should check our Grey Market Review, as well as the step-by-step tutorials on How to Enable/Disable 2-FA on Grey Market.
Anyway, the steps to login On Grey Market using 2-FA are:
Step 1-> Enter your username and Password on the login page.
Step 2-> Decrypt the displayed PGP Message.
Step 3-> Paste the Decrypted code on the login page. Done.