HubSpot is a completely free CRM that brings you a full stack of software that includes marketing, sales, and customer service solutions.
First, you need to connect AutomatorWP with HubSpot through the add-on settings, as explained here. After setup this connection, you can create automations using the HubSpot add-on actions.
Also, check this page to see how to correctly set up your contact lists on HubSpot to be used on the action “Add or remove a contact to list” included on this add-on.
You can check the automations samples page, where you can see some samples of this add-on’s possibilities.