Permalink changes gives me 404 [closed]

by

Is your rewrite rule in your .htaccess well configured?
Can you post it here?

Should be configured like this:

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

Source:
Codex page on pretty permalinks