I followed exactly this tutorial and I got this error:
Fatal error: Call to undefined function add_settings_field() in /home/content/41/11334041/html/test/wp-content/themes/mothereffintheme/functions.php on line 47
I'm new to working with the Wordpress API and I don't have any idea to how to fix it.
I saved it in my FTP program instead of the the theme editor. It worked!
Are you sure you loaded WordPress? add_settings_field() is a WordPress function rather than a default PHP function, if it's undefined it would indicate that the WordPress core hasn't been loaded. A bit of code might help. http://codex.wordpress.org/Function_Reference/add_settings_field