How to install support forum inside the opencart like here ?

Hi all,

Can any one tell me how to install support forum (phpbb or someother supported forum scripts) like what we see here ?

example:

http://forum.opencart.com/

I know how to install forums on my website.. but i want to know to how to install it within the open cart v.1.5.02 .. Any suggestions please...

Lol forum is a subcdomain how u would do it go into dns records add a new zone forum then ip and then add subdomain forum then use quick instaler and pick forum.url

However, there you still need to work out user logins.
But if you don't mind 2 logins, just install in the subdomain like the above suggestion.