Both Android and iOS use the WordPress.com API to connect with your WordPress.com username and manage your hosted sites. WordPress.com uses OAuth2 and requires a shared secret for application installs to be able to pair and authenticate. In order to connect to a WordPress.com account you will need to register for an account over at https://developer.wordpress.com. Once you have an app id and an app secret, follow the instructions here. The only WordPress.comWordPress.com An online implementation of WordPress code that lets you immediately access a new WordPress environment to publish your content. WordPress.com is a private company owned by Automattic that hosts the largest multisite in the world. This is arguably the best place to start blogging if you have never touched WordPress before. https://wordpress.com/ account you will be able to connect to will be the one you used to register for a developer account. More details can be found here. You can connect to any self-hosted instances of WordPress without any additional configuration.