Furocan on "changing permalinks destroys site and dashboard"

hihi, yeah I clicked the save change buttons, and when I do, it comes to the crash I described.

sure!

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wordpress/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wordpress/index.php [L]
</IfModule>

# END WordPress

Also i searched a little bit how I can check if the mod_rewrite work correct, and I found this:
https://www.blogging-it.com/apache-mod_rewrite-modul-testen/server/apache-web-server.html
Yeah, it's in german, but I the important fact is the code and the files. I uploaded to http://www.georgs-kirche.de/test/index.php
and there is also an Error 500! Should I request my hoster again?