How can I print a page from kindle app on iPhone6s?

Hi

The Kindle app does not presently offer printing features.

Subject to copyright considerations, you may find that the following process meets your needs:

• Take a screenshot of the page:

  How to take a screenshot on your iPhone, iPad, and iPod touch - Apple Support

• In the Photos app, tap the Share button and print your photo.

If you are trying to print a page from a book, you may not have that option due to copyright issues. I can print my own pdf files in the Kindle app because the option to do so exists.