How to Enable XML-RPC Access to Your WordPress Site
WordPress’ XML-RPC support enables you to post to your blog via an application on your mobile device or other 3rd party service such as Blogger or MovableType. Enabling XML-RPC is very easy.
Log in to your WordPress site and go to Dashboard >> Settings >> Writing. Scroll down to Remote Publishing, then check XML-RPC and save your changes. Now your blog is open to receiving posts using remote publishing.