MyBB Community Forums

Okay so i have a website but i added a external forum (mybb) so now you need 2 logins one for the site and one for the forum how could i make it so you need 1 login for both?

Ok, how is the login authenticated on the main site? Is the main site some free/paid software or is it custom built?

You can just include mybb's global.php and use the $mybb->user array to get logged in user information.