BuddyPress.org

I’ve spent 2 days browsing dozens of examples for this and trying all sorts of variations (this seems to be a headache for a lot of developers). The code below successfully adds a new item in the menu on the home page, but when I click on the ‘Courses’ tab, it not only does not display what I expected, it goes to the generic membership listing. I have to be missing something.
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function wkd_add_courses_navigation () {
   bp_core_new_nav_item( array( 
	'name' => 'Courses', 
	'slug' => 'courses', 
	'position' => 15, 
	'show_for_displayed_user' => true, 
	'screen_function' => 'wkd_display_course_info'
   ));
}
function wkd_display_course_info() {
   add_action( 'bp_template_title', 'wkd_course_title' );
   add_action( 'bp_template_content', 'wkd_course_listing' );
   bp_core_load_template (apply_filters( 'bp_core_template_plugin', 'members/single/plugins' ));
}
function wkd_course_title () {
   echo "COURSE PAGE TITLE";
}
function wkd_course_listing () {
   echo "This was fun";
}