It doesn't work 'out-of-the-box' and there's no obvious way to activate it. You have to go to their site and dig a bit, but here's the instructions:
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Go to the Android system settings
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Navigate to
Connected devices > Connection pre (you can also find it by inserting
"Android Auto" in the search box)
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Scroll to the bottom until you find "Version"
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Click multiple times on "Version" to activate developer settings
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Press "OK" in the activation dialog
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After activation, click on the 3-dot menu in the top-right and go to "Developer settings"
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Scroll down until you find "Unknown sources" and tick the checkbox
-Restart your phone
You should now be able to use NewPipe in the car interface