To unblock someone, simply scroll to the bottom of ANY message in your inbox (it does not have to be from this user), and click on ‘Blocked User List’ to make your selection.
You'll know that you're blocked if you get a block message when you try to contact someone who has specifically blocked you. The message will read "communication with this member is no longer possible". You can also be blocked from messaging users if you do not meet their messaging criteria shown at the bottom of their profile (ie age, gender) - these settings are found in Mail Settings.
