HubSpot is a completely free CRM that brings you a full stack of software that includes solutions for marketing, sales, and customer service.
HubSpot add-on adds new actions to let you connect any of the WordPress plugins supported by AutomatorWP with this CRM.
First, you need to connect AutomatorWP with HubSpot through the add-on settings as explained here. After setup this connection, you are able to create automations using the HubSpot add-on actions.
Also, check this page to meet how to correctly setup your contact lists on HubSpot to be used on the action “Add or remove contact to list” included on this add-on.