[HELP] What is the rewrite rules for domain.com/forums to www.domain.com/forums?

Hi guys, I need help. i installed wordpress on my main domain which is sgpspclub.com, and i have moved my forum to "sgpspclub.com/forums". can someone give me the rewrite codes for directing non-www -->> domain.com/forums to www.domain.com/forums?

Example, when people type domain.com/forums it will direct them to www.domain.com/forums.

 

Can someone pls help me with this?

 

RewriteEngine On
RewriteCond %{HTTP_HOST} ^yourdomain.com
RewriteRule (.*) http://www.yourdomain.com/$1 [R=301,L]

 

i tried your code on public_html/forums but it direct me to http://www.domain.com//home/psp/public_html/forums any ideas? i have been trying hard to find a code that can help me but so far none..

 

My main root htaccess is using the codes:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

my public_html/forums is using the below codes:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^yourdomain.com
RewriteRule (.*) http://www.yourdomain.com/$1 [R=301,L]

 

Also change your .httaccess permission 777.