Here's the link to the section you needed in the training portal: https://dovetailmktg.kartra.com/portal/mgsitlogin/subcategory/66
If you've been running your ad(s) for 2 days or more and your cost per lead is too high, this is a 30-second thing to try. Basically you're just going to duplicate the ad set and the ad in it (the ad will duplicate along with the ad set if you duplicate at the Ad Set Level) and see if the algorithm won't do something different. When you duplicate it, make sure you schedule the new one to start at Midnight (for whatever time zone your ad account is setup for).