How can I block some member outside of Live chess. I know that blocking option exists in Live chess. But what if I want to block somebody who is sending me unwanted messages? It does not happen within Live chess.

Also how can I unblock a previously blocked member? and how can I see the list of blocked members?

When you point your cursor top right on your homepage a drop down menu appears.

On that click where it shows Account, the page opens then click on Privacy

This page opens http://www.chess.com/home/privacy

There is a 'Block User' option half way down the page.

genie i apolagize, i unblock you