The Pixel Chat service allow you to connect to your Pixel Chat account and control your overlays. To connect the service, head to the Dev Tokens webpage on Pixel Chat's website (See the link inside the Pixel Chat section of the Services page in Mix It Up) to generate a Dev Token. Copy the Dev Token into the text box in Mix It Up and click Log In.
To interact with Pixel Chat, you would add a Pixel Chat Action to your command.