From My Tribe 

a. On the web

  1. Click on My Tribe in the navigation bar;
  2. Connections will be listed on the connected tab;
  3. Click block for any connection.

b. On a mobile device

  1. Tap on your image in top left corner to view the menu. Tap My Tribe
  2. Scroll down to find the member you want to block;
  3. click block.