If you don't have FTP Access it will be a bit harder. If you don't have Admin Access it will be impossible.
WordPress is structured relatively simple. You won't need to make changes in
wp-includes do go into the
wp-content folder, then
themes then your currently active theme. Here you'll find a bunch of connected PHP files, be careful because misplacing a bracket or semi-colon could throw your entire website "out-of-wack". You're looking for
footer.php to edit. Edit it change what you need and upload it.
First check to see if your theme comes with some way to edit that sort of thing. Usually there's an extra menu item at the bottom called "Theme Settings", this could be under "Appearance" or "Settings" but if it's there, look through that to see if you're able to change it. Another thing you could do is under "Appearances" there's an "Editor" link which will allow you to edit your theme directly from the admin panel. Again you're looking for
footer.php to change what you need, then save.
If you're not comfortable with editing these PHP files, can't find what you're looking for, and the Theme doesn't come with some kind of built in options to change this sort of things, the safest route would be to spend a $20 and just get a developer to do it for you. Much better option than messing up your theme.
Some helpful links could be:
Norma Theme Support
WordPress Theme Support
Getting Started With WordPress
Stepping Into Templates