How to Hide DocsPress Admin Menus

function plt_hide_docspress_menus() {
	//Hide "DocsPress".
	remove_menu_page('docspress');
	//Hide "DocsPress → Documentations".
	remove_submenu_page('docspress', 'docspress');
	//Hide "DocsPress → Categories".
	remove_submenu_page('docspress', 'edit-tags.php?taxonomy=docs_category&post_type=docs');
	//Hide "DocsPress → Settings".
	remove_submenu_page('docspress', 'docspress-settings');
}

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

Where do I put this code?