Tips on Customizing Developer Portfolio

How to Hide Developer Portfolio Admin Menus

function plt_hide_developer_portfolio_menus() {
	//Hide "Projects".
	remove_menu_page('edit.php?post_type=atc_dp_projects');
	//Hide "Projects → All Projects".
	remove_submenu_page('edit.php?post_type=atc_dp_projects', 'edit.php?post_type=atc_dp_projects');
	//Hide "Projects → Add New".
	remove_submenu_page('edit.php?post_type=atc_dp_projects', 'post-new.php?post_type=atc_dp_projects');
	//Hide "Projects → Programming Languages".
	remove_submenu_page('edit.php?post_type=atc_dp_projects', 'edit-tags.php?taxonomy=atc_dp_languages&post_type=atc_dp_projects');
	//Hide "Projects → Tools  Technologies".
	remove_submenu_page('edit.php?post_type=atc_dp_projects', 'edit-tags.php?taxonomy=atc_dp_tools&post_type=atc_dp_projects');
	//Hide "Projects → Platforms".
	remove_submenu_page('edit.php?post_type=atc_dp_projects', 'edit-tags.php?taxonomy=atc_dp_platforms&post_type=atc_dp_projects');
}

add_action('admin_menu', 'plt_hide_developer_portfolio_menus', 15);

Where do I put this code?

How to Hide the "Project URL" Meta Box

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

	//Hide the "Project URL" meta box.
	remove_meta_box('atc_dp_meta', $screen->id, 'side');
}

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