Multi store multi domain issue

Hi all,

I recently installed the latest version of OpenCart and chose it for the multiple store option from same admin but having trouble making it work.
The default shop is in /public_html/shop
I then used the addon domains feature in my cpanel to add the other domain name I would like to use for store 2 pointing it to the same folder as the default store public_html/shop.
I then set up store 2 by using the insert feature on OpenCart: system > settings

However, when I enter the addon domain name into my browser it loads up the default site. Do I need to change a setting in any of the php or mysql htaccess to make the additional domain point to the other shop and work correctly?
Thanks
Tom