how do i install the irunes app on my cromebook it uses google play

Oh, I see. You'll have to find a computer that can get iTunes (or already has it). Maybe you have a friend or family member that could help?

If not, you can take it to an Apple Store, and the employees will be happy to help!

Apple - Find Locations

Installing iTunes on a Chromebook is not possible, as Apple only provides versions of iTunes for macOS and Windows. Chrome devices use ChromiumOS, which is a derivative of Linux.