Click the white search bar at the top of the page.
Type the name of the podcast you're looking for. (Tip: It will be easier to find the show if you type the title of the show exactly.)
To limit your search to podcasts only, click on "Everything" and select "Podcasts" from the drop down menu.
Hit your Enter key to start the search. This will take you to a list of podcasts that match your query.