From the menu on the left side of the Home Screen (press the Home button on your remote a few times to get there), highlight "Streaming Store" (or "Streaming channels") and press OK on your remote. Search for "apple" and you should find it. Highlight it, press OK, and follow the prompts.
You can also add it from the website:
https://channelstore.roku.com/details/a20e3c294993147c6cda435497594031/apple-tv
See this for more information:
https://support.roku.com/article/360036652634
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