Follow these steps to create and add a media list to your campaign:
Go to Search Tab
Click "New Search"
Click "Search by Keywords"
In the "Search title, episodes, or even hosts!" field, enter your search and hit Enter
Click on the podcast that you like
Click "Add to Media List"
Click "Save & Go to the List"
Click "Add to Campaign"
Select one of your campaigns
Click "Proceed"
Go to Profiles
Click "View Campaign"
If you want to see a visual of this process, go to this link
How To Create And Add Media List To Campaign | Scribe