Tips on Customizing Open edX LMS and WordPress integrator (LITE)

How to Hide Open edX LMS and WordPress integrator (LITE) Admin Menus

function plt_hide_edunext_openedx_integrator_menus() {
	//Hide "Open edX WP-Integrator".
	remove_menu_page('wp-edunext-marketing-site_settings');
	//Hide "Open edX WP-Integrator → All Open edX Enrollment Requests".
	remove_submenu_page('wp-edunext-marketing-site_settings', 'edit.php?post_type=openedx_enrollment');
	//Hide "Open edX WP-Integrator → General settings".
	remove_submenu_page('wp-edunext-marketing-site_settings', 'admin.php?page=wp-edunext-marketing-site_settings&tab=general');
	//Hide "Open edX WP-Integrator → Navigation Settings".
	remove_submenu_page('wp-edunext-marketing-site_settings', 'admin.php?page=wp-edunext-marketing-site_settings&tab=navigation');
	//Hide "Open edX WP-Integrator → Course buttons".
	remove_submenu_page('wp-edunext-marketing-site_settings', 'admin.php?page=wp-edunext-marketing-site_settings&tab=enrollment');
	//Hide "Open edX WP-Integrator → Woocommerce Integration".
	remove_submenu_page('wp-edunext-marketing-site_settings', 'admin.php?page=wp-edunext-marketing-site_settings&tab=woocommerce');
	//Hide "Open edX WP-Integrator → EOX API".
	remove_submenu_page('wp-edunext-marketing-site_settings', 'admin.php?page=wp-edunext-marketing-site_settings&tab=eoxapi');
}

add_action('admin_menu', 'plt_hide_edunext_openedx_integrator_menus', 11);

Where do I put this code?

How to Hide the "eduNEXT WP - Open edX integrator | Shortcode Help" Meta Box

function plt_hide_edunext_openedx_integrator_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "eduNEXT WP - Open edX integrator | Shortcode Help" meta box.
	remove_meta_box('exo-shortcode-help', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_edunext_openedx_integrator_metaboxes', 20);