can i install itunes on hp chromebook and if so how

No.

Apple do not make a version of iTunes for the Chromebook.

Anything you see labelled as "iTunes for Chromebook" is probably going to be some sort of bodge, which may not work in the way you expect.

Yes, download it from the App Store. (WindowsAppStore) or search for “ITunes Download Chromebook” on any search engine, and you can go from there.