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YouTube is a file sharing service where you can view and upload your own video clips. Before you can use the application, it needs to be downloaded and installed. Follow these instructions to install YouTube.
Before you can install YouTube, you need an Apple ID. If you don't have an Apple ID, you can create one at www.apple.com
Find "App Store"
Log on to App Store if you're asked to do so.
Wait a moment while the application is installed.