// Admin footer modification  
      
    function remove_footer_admin ()  
    {  
        echo '<span id="footer-thankyou">Developed By:<a href="http://www.yourdomain.com" target="_blank">Your Company Name</a></span>';  
    }  
    add_filter('admin_footer_text', 'remove_footer_admin');

http://rnydm.us/r5DgdP

Add to bottom of your theme's functions.php file

Customizing Wordpress Admin Footer

php, wordpress

PHP