You can block any client that appears in your 'My Client' list by clicking on the "Block Client" button beneath the client of your choice. 

Blocking a Client prevents the Client from contacting you via LIVE session only. The customer may still send you an email request, however, you may always choose the "Decline to Answer" option. Since our block feature is by member ID number, once a client is blocked, they will be unable to contact you under an alternate screen name.

You may unblock a client at any point by clicking the "Unblock Client" link beneath the client of your choice.