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Tips on Customizing NoticeWave Popup

How to Hide NoticeWave Popup Admin Menus

function plt_hide_noticewave_popup_menus() {
	//Hide "Announcements".
	remove_menu_page('edit.php?post_type=ntwv_announcement');
	//Hide "Announcements → Announcements".
	remove_submenu_page('edit.php?post_type=ntwv_announcement', 'edit.php?post_type=ntwv_announcement');
	//Hide "Announcements → Add New Announcement".
	remove_submenu_page('edit.php?post_type=ntwv_announcement', 'post-new.php?post_type=ntwv_announcement');
	//Hide "Announcements → Settings".
	remove_submenu_page('edit.php?post_type=ntwv_announcement', 'noticewave-ann-settings');
}

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

Where do I put this code?

How to Hide the "Announcement Settings" Meta Box

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

	//Hide the "Announcement Settings" meta box.
	remove_meta_box('noticewave_ann_settings', $screen->id, 'normal');
}

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