Having defined the start criteria, you will next want to add a campaign to be sent to your contacts. Simply drag and drop a Campaign node from the node panel on the far left side onto the canvas.
Click on the Campaign node to select your campaign. A panel of options will slide in from the right side of the screen.
In this panel, click to select a campaign and you will be presented with a list of your triggered campaigns.
(If there are no campaigns, you will need to create at least one triggered campaign.)
You can sort these by campaign name or date modified. Click on the magnifying icon to preview your campaigns from here.
You can also search your campaigns by name.
Select the campaign you want from the list, and then use the button to Apply your changes to the node.