The page is available only when the WordPress Support plugin is enabled. The plugin is bundled with PhpStorm and activated by default. If the plugin is not activated, enable it on the Plugins page of the Settings / Preferences Dialog as described in Enabling and Disabling Plugins.
Use this page to enable the use of the WordPress Content Management System through the PhpStorm user interface. To use WordPress in the command line mode, configure it as a command line tool in Command Line Tool Support: WP-CLI.