Here's the link to the section you needed in the training portal: https://dovetailmktg.kartra.com/portal/mgsitlogin/post/244
This kind of retargeting is VERY easy to do. You're just copying your existing ads and doing some quick changes to the targeting. There's not a lot to do. You can do this in about 5 minutes.
This is super important to do because a lot of people just need another opportunity or more reinforcement to become a lead. This is the 'skepticism melter' technique!