I've created a few forums but when I access them I get a 404 error.

In the admin panel I have this ...


Here you can set up various options of the phpBB SEO Ultimate SEO URL mod (Support Forum).
The various default settings such as the delimiters and suffixes still must be set up in phpbb_seo/includes/setup_phpbb_seo.php, since changing these implies an .htaccess update and most likely appropriate redirections.


What do I do??