Go to The Nintendo eShop, find the "Applications", and download Youtube. You must have Internet to download the application, and the Youtube app is totally free of charge.
If you have an Internet connection, you can connect to the Nintendo E-shop application that comes with the system. When that loads, search for Youtube in the search bar. Considering you have the right amount of space on your 3DS, you can download it and play it from the home screen!
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