Hi there! You should create a child theme and look into extending the footer.php template with a menu. You can learn more about child themes on this Codex entry: http://codex.wordpress.org/Child_Themes
Also note that the actual text in the footer comes from an action. If you'd like to modify the text, look into the expound_display_credits function in the functions.php file. You can easily remove that and add your own with a child theme with remove_action and add_action.
Hope that helps!
