Change page path in WordPress site

I KNOW this question is more appropriately answered on wordpress.com. However, I asked the question and no one has answered yet. So here is my question:
I want to change the url of the following page (which may or may not be published yet):
juantutors.com/philip-becker/
to the url:
juantutors.com/testimonials/philip-becker/
Note the different PATH, not just a prettified URL
I don't have a page at…
Change page path in WordPress site

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