I created a new file theme-functions.php defining the get_sidebarLeft() and get_sidebarRight() functions. I saved this file to the theme’s folder, and deleted the same function definations from wp-includes/template-functions-general.php. The functions were not recognized when I refreshed the browser. Do I need to call the theme-functions.php file so the function definations can be found? If so, how do I do this? If not, what am missing?