Remove Powered by: wordpress

I would like to remove the powered by: wordpress and theme details in the footer of my Evolution Pro site and add Published by: Navid Mughal with a link to www.navidmughal.com I understand this can be edited as a shortcode but I am a novice and I don't know how to do this and would like help please. My site is not live yet so I can't send the URL. Sorry thanks Navid