There may be times when other handshake members cause issues for you. You can prevent any future interaction with these users by adding them to your Blacklist.
To add a member to your Blacklist, simply go to My account and click on the Blacklist user link. From there you can access your Blacklist, where you can enter the username of the member you wish to block.
If you are blacklisted by another member there is little we can do about this for you. Blacklisting is completely up to each individual member.