Google SEO - wrong rewrite

[RigPa]

I have my forum installed like this: http://creepysuperzombie.com/forum/

When I look at the Google SEO plugin it says Add to .htaccess:
RewriteEngine on

# Some hosts require RewriteBase to make RewriteRules work.
RewriteBase /forum/

# Google SEO workaround for search.php highlights:
# Make this rule the first rewrite rule in your .htaccess!
RewriteRule ^([^&]*)&(.*)$ http://creepysuperzombie.com/forum/$1?$2 [L,QSA,R=301]

# Google SEO 404:
ErrorDocument 404 /forum/misc.php?google_seo_error=404

# Google SEO Sitemap:
RewriteRule ^sitemap\-([^./]+)\.xml$ misc.php?google_seo_sitemap=$1 [L,QSA,NC]

# Google SEO URL Forums:
RewriteRule ^Forum\-([^./]+)$ forumdisplay.php?google_seo_forum=$1 [L,QSA,NC]

# Google SEO URL Threads:
RewriteRule ^Thread\-([^./]+)$ showthread.php?google_seo_thread=$1 [L,QSA,NC]

# Google SEO URL Announcements:
RewriteRule ^Announcement\-([^./]+)$ announcements.php?google_seo_announcement=$1 [L,QSA,NC]

# Google SEO URL Users:
RewriteRule ^User\-([^./]+)$ member.php?action=profile&google_seo_user=$1 [L,QSA,NC]

# Google SEO URL Calendars:
RewriteRule ^Calendar\-([^./]+)$ calendar.php?google_seo_calendar=$1 [L,QSA,NC]

# Google SEO URL Events:
RewriteRule ^Event\-([^./]+)$ calendar.php?action=event&google_seo_event=$1 [L,QSA,NC]


I click: Click to Apply changes to core files.


It seems that nothing are being written to .htaccess but when I click this every thread in the forum goes to the main 404 error page because of the rewrite - not the forum 404.

Adding the code manually also makes every post in the forum go to 404 page.

Is this plugin not able to handle sub domains?