If you want to change your Permalink Structure in WordPress from :

http://www.projectheavytraffic.com/?p=123  
to

http://www.projectheavytraffic.com/2007/12/23/sample-post/  
All you have to do is:  

1. Create a new file called “.htaccess” in any text editor and past the following content   <IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>  into the .htaccess file. 2. Upload the file to your homepage root folder.
3. Go to […]