MyBB Community Forums

Hi,
I want to make SEO friendly url's of my forum.
What can i do with .htaccess file?
This is my .htaccess file codes.

ErrorDocument 404 /content/404.php
Options All -Indexes
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteBase /
RewriteRule ^([0-9]+)$ index.php?page=$1 [L]
RewriteRule ^install/$ install/ [L]
RewriteRule ^admin/$ admin/index.php [L]
RewriteRule ^rss/$ content/feed-rss.php [L]
RewriteRule ^manage/$ content/item-manage.php [L]
RewriteRule ^publish-a-new-ad.htm content/item-new.php [L]
RewriteRule ^contact.htm content/contact.php [L]
RewriteRule ^terms.htm content/terms.php [L]
RewriteRule ^privacy-policy.htm content/privacy.php [L]
RewriteRule ^sitemap.htm content/site-map.php [L]
RewriteRule ^advanced-search.htm content/search.php [L]
RewriteRule ^map.htm content/map.php [L]
RewriteRule ^register-new-account.htm content/account/register.php [L]
RewriteRule ^login.htm content/account/login.php [L]
RewriteRule ^logout.htm content/account/logout.php [L]
RewriteRule ^forgot-my-password.htm content/account/recoverpassword.php [L]
RewriteRule ^settings.htm content/account/settings.php [L]
RewriteRule ^my-account/$ content/account/index.php [L]
RewriteRule ^offer/(.+)/(.+)/$ index.php?category=$1&type=0&location=$2 [L]
RewriteRule ^offer/(.+)$ index.php?category=$1&type=0  [L]
RewriteRule ^need/(.+)/(.+)/$ index.php?category=$1&type=1&location=$2 [L]
RewriteRule ^need/(.+)$ index.php?category=$1&type=1 [L]
RewriteRule ^classifieds/(.+)/$ index.php?location=$1 [L]
RewriteRule ^(.+)/(.+)/(.+)/$ index.php?category=$2&location=$3 [L]
RewriteRule ^(.+)/(.+)/$ index.php?category=$2 [L]
RewriteRule ^category/(.+) $1/ [R=301,L]
RewriteRule ^(.+)/$ index.php?category=$1 [L]
RewriteRule ^(.+)/(.+)/([0-9]+)$ index.php?category=$2&page=$3 [L]
RewriteRule ^(.+)/([0-9]+)$ index.php?category=$1&page=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)/(.+)/(.+)/(.+)$ /$3/$4-$1.htm [R=301,L]
RewriteRule ^(.+)/(.+)/(.+)-([0-9]+).htm$  item.php?category=$2&item=$4 [L]
RewriteRule ^(.+)/(.+)-([0-9]+).htm$  item.php?category=$1&item=$3 [L]
</IfModule>

Use Google SEO plugin.