How to make the URL clean, so it does not display like this http://mywebsite.tld/forums/index.php?p=

I have installed Vanilla Forums, but I have something that is bugging me. My URL is http://mywebsite.tld/forums/index.php?p=/activity how can I get it to be clean URL like http://mywebsite.tld/forums/categories/general ?
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Answers
http://vanillaforums.org/docs/installation#moreinfo
That's apache2 stuff, I don't use apache.
And you're apparently trying to use the .htaccess of vanilla after one was used by wordpress.
The structure of files is same as my old installation.
/htdocs/forum/[ALL VANILLA FILES]
/htdocs/[ALL WP FILES]
All is well now. Now off to figuring out how to change the link in notification email to point to embedded version.
$Configuration['Garden']['RewriteUrls'] = TRUE;
What else can be wrong?