Tips on Customizing Zenbit Invitation Builder

How to Hide Zenbit Invitation Builder Admin Menus

function plt_hide_zenbit_invitation_builder_menus() {
	//Hide the "Invite Templates" menu.
	remove_menu_page('edit.php?post_type=zenbinv_template');
	//Hide the "Invite Templates → Invite Templates" menu.
	remove_submenu_page('edit.php?post_type=zenbinv_template', 'edit.php?post_type=zenbinv_template');
	//Hide the "Invite Templates → Add New Template" menu.
	remove_submenu_page('edit.php?post_type=zenbinv_template', 'post-new.php?post_type=zenbinv_template');
}

add_action('admin_menu', 'plt_hide_zenbit_invitation_builder_menus', 100);

Where do I put this code?

How to Hide Zenbit Invitation Builder Meta Boxes

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

	//Hide the "Template Editor" meta box.
	remove_meta_box('zenbinv_template_editor', $screen->id, 'normal');
	//Hide the "Assets" meta box.
	remove_meta_box('zenbinv_assets', $screen->id, 'side');
	//Hide the "Template Assignment" meta box.
	remove_meta_box('zenbinv_template_assignment', $screen->id, 'side');
}

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