Scroll all the way to the right, where you’ll find the “Ready to Install” section. You’ll find that your 360 games are accessible there for download if they are compatible with Xbox One. Select the game and confirm that you want it to be installed on your Xbox One. You’ll then be able to select it from your list of playable games.

Note that you will need to keep the disc in the Xbox One console during play, and you will need to insert it each time you wish to play that game again.