Q: would like to import my itunes songs to the amazon echo. How do I do that?

Per this Amazon support page it looks like you would need to upload your iTunes tracks into your Amazon music library. https://www.amazon.com/gp/help/customer/display.html?nodeId=201549700 and https://www.amazon.com/gp/help/customer/display.html?nodeId=201379280

From the Apple or iTunes side you would just open your Finder and from your home folder go into Music, iTunes, and then browse to the albums or songs you want to upload to Amazon. Of course this presumes your iTunes music is not DRM protected but anything you've purchased from iTunes in recent years won't have DRM. If you're using an Apple Music subscription then you won't be able to transfer any AM tracks you've downloaded for offline listening as they are DRM protected.