noob alert - please help me with some htaccess...

i can't get to solve this, I installed friendly urls on a forum and i need to redirect from www.domain.com/forum/ to www.domain.com/forum/forums.html , also i need to redirect the non www version, but I have blog.domain.com that stops working when i do that.

my htaccess files currently looks like this

Where and what should I put to make it work?

 

still searching

 

please!!!!!!!!!1112 :|

 

Start the .htaccess file with:

Options +FollowSymlinks
RewriteEngine on 
RewriteCond %{HTTP_HOST} ^domain.com$ 
RewriteRule ^(.*)   http://www.domain.com/$1  [QSA,L,R=301]
RewriteCond %{HTTP_HOST} ^www.domain.com$ 
RewriteRule ^forum/?$   http://www.domain.com/forum/forums.html [QSA,L,R=301]

Code (markup):

Jean-Luc