1. go to frontend of your chat as logged in member (this will create user in blastchat server)
2. go to
www.blastchat.com "Your registration" menu link and find Users area, there you will see your member which you can assign as SuperAdmin (after that this member will see Admin area directly inside chat)
2a. you can find same "Users area" in your admin backend under BlastChat configuration or Blastchat registration" menu (inside chat window, find "Configuration" menu link