If you are unsure of the title of the campaign you wish to use, you can go to Reports by clicking Email in the left-hand menu and then the Reports tab. All of your sent campaigns will be here.

Once you know which campaign you want to use, go to Automation and edit your Automated Campaign or create a new one.

Add a new action and from the drop down menu labelled Chosen Email, select the title of your campaign. Click Make Copy to then be added as a step to the automation. You can edit the content of the email further if you wish.