In order to ban Group Member :

  • Click on Members Tab
  • Hover/Click on User Options
  • Click on the Ban Button
  • Under take action Select Ban
  • Click on Take Action

Alternative Method :

You can even ban the Group Member directly from chat area :

  • Hover/Click on User Message
  • Click on the User (with lock) Icon
  • Under take action Select Ban
  • Click on Take Action