I am use shoutbox free version  but it have problem  
shoutbox not expand for guest
if I use pro version  this problem  solve it?
and  I buy one package  
Do I can use to 5 domain? 

That issue is fixed in pro, and no, you need 5 licenses for those 5 domains. 1 license per domain. 

thank you and will respond.

Glad to help