Not sue what metadata we are talking about. Bubble one links to Google trends. Bubble two relates to data tables. Neither seem to have metadata.
Go to slide 12 of the Unit 9 presentation. On the right side they are showing you a more into link. All of the code.org datasets have one with a description of the database.
Click the triangle in front of Animals. Click the triangle in front of Cats.
Now click More info.