If you haven't already, log into your Adafruit account and then head over to io.adafruit.com.
Check out the following guides to understand the basics of creating a feed and a dashboard:
Also check out the projects page for a list of projects and examples to help understand the service.
Continue on reading this guide to learn about the client libraries that are available to send and receive data with Adafruit IO. In addition you can learn about the protocols that Adafruit IO uses and how to use them with your own client code.