Oh you mean the permalink structure of wordpress? Try changing this between default and date and name based, and when you click "update", you should see a message near the top of the page, which will either say "permalink structure updated" or "change/edit your .htaccess file now".
If you get the second option, then Wordpress cannot access the .htaccess file which is in the public_html folder of your files. Try my steps below, and after each one, then try updating the permalink structure, and see if it works:
1) CHMOD the .htaccess file to 666, also known as RW-RW-RW (Read write, Read write, Read write). This enables everyone including Wordpress to write to the .htaccess file. Howeer, this can cause security vulnerabilities and is not recommended if you are a large site with a lot of traffic because a hacker may attempt to mess with this. For your site, you should probably try this though.
2) If the above hasn't worked properly, then do this: Edit the .htaccess file and place this code in there, unless there it already exists:
Quote:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
SecFilterCheckURLEncoding Off
</IfModule>
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Now try to see if the permalink update works.
3) You might suddenly receive a 500 internal server error message when accessing your site. Don't panic! Go back and delete the .htaccess file, then CREATE A NEW ONE, again named .htaccess. Keep this blank. Try updating the permalink structure now.
4) If you've reached this far, then I've only got one suggestion left. Delete everything in the .htaccess file, then place this code in there:
Quote:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
SecFilterCheckURLEncoding Off
</IfModule>
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
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Try an update now. If it still doesn't work, have a look back at the .htaccess file and see if there is anything say "BEGIN WORDPRESS" and "END WORDPRESS". If there is, try just deleting these words, BUT NOT THE CODE BETWEEN THEM!
If you've tried everything and the permalink structure can't update, then contact your hosts. They might be able to sort out the problem.
Talkupation appreciated

Hope I've helped,
Dan (whym)
Please note: I've tried to help you with the above code, but if things don't work or you get errors and can't access your site, then I'm not responsible. If these things happen, then contact your hosts who should be able to fix things for you.