The tutorial provides a step-by-step guide on integrating ActiveCampaign with Trello using Zapier. It begins by logging into ActiveCampaign and navigating to the apps section to find Trello. The integration process involves using Zapier to connect both platforms. Users are instructed to log into Zapier, create a zap, and select ActiveCampaign as the trigger. Various triggers like 'new contact added' can be set to initiate the process. The next step is to select Trello as the action app and choose 'Create Card' to ensure new cards are added to Trello when the trigger occurs. Users can specify which Trello boards and lists should receive the new cards and map data from ActiveCampaign to Trello, such as using contact names as card names. After setting up, users can test the integration and activate the zap if successful. This integration highlights the flexibility of ActiveCampaign in using third-party software like Zapier to create automated workflows.