How to change a page url

Hi,

I want this url https://celsius.com/the-science-2/ to be https://celsius.com/science

Q1: will changing the permalink on the Page itself be sufficient?

Q2: when you type in https://celsius.com/science now, it redirects you to a dev page that looks nothing like the https://celsius.com/the-science-2/ page. so if i change the permalink on the page itself, how will that affect the redirecting of celsius.com/science to this dev page? i don’t want visitors to see this page now because it doesn’t make any sense anyways.

Thank you for your input.