Forum .htaccess ???

[محروم.كوم]

Hello everyone. I am new to vBulletin script and I just installed my first one. I'm having trouble with the htaccess and friendly URL's. I have wordpress on my main site and forum in /forum subfolder. I have looked through the do not upload folder and found the htaccess to use but when Iadd it I get an internal server error. If I add the content to the bottom of the htaccess that I have for wordpress I get a 404 error and it shows the error page from the wordpress install.

Here is what I had before. it might have htaccess details for the SMF forum I previously had installed.

Code:
# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]


# END WordPress
and here is what I currently have.
Code:
# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]


# END WordPress

RewriteBase /forum/

RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d

RewriteRule ^.*$ - [NC,L]

# Forum
RewriteRule ^threads/.* showthread.php [QSA]
RewriteRule ^forums/.* forumdisplay.php [QSA]
RewriteRule ^members/.* member.php [QSA]
RewriteRule ^blogs/.* blog.php [QSA]
ReWriteRule ^entries/.* entry.php [QSA]

RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d

RewriteRule ^.*$ - [NC,L]

# MVC
RewriteRule ^(?.*?)(?:/|$))(.*|$)$ $1.php?r=$2 [

I have changed the settings to use the Mod Rewrite Friendly URLs
and
Enforce Canonical URL to "Strict" __DEFINE_LIKE_SHARE__