MyBB Community Forums

Hey guys, 
i am currently working on a gaming community. 
"http://www.american-tactics.com" (No means for advertising)
So i have a home page and stuff with an .htaccess file in the root folder
with the following code in the .htaccess

ErrorDocument 404 /error404.html
ErrorDocument 403 /error403.html
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.html [NC,L]

but when i enter my forums which is on the same server but a different folder 
https://www.american-tactics.com/forums 
it give's the following error

Quote:Not Found

The requested URL /forum was not found on this server.

how do i fix this?

Your existing htaccess code is something like domain/forum -> domain/forum.html(base) so you have to modify it or try accessing your forum like domain/forum/index.php

My bad seems like another problem that is you have not setup SSL for your website so it must be redirecting to somewhere else(can be a different directory). Try to configure your SSL or visit your website without https