To block another Pornhub community member, you must first login by visiting http://www.pornhub.com/login and then navigate to the person's profile page. Choose “BLOCK USER” found at the bottom of the right side of their page.
To unblock someone, please choose “Settings” from main menu and then click “Block List” tab. Simply click the “Unblock user” button next to the user you’d like to unblock.