anchorpoint

I tried adding this but it doesn't seem to work. The URL is the page I want the button to be redirected to (not in new window). onclick="location.href='https://www.setstuffrentals.com/confirmation'

I have an 'I agree' button on this page https://www.setstuffrentals.com/credit-card-authorization/ I basically need the button to redirect to another web page after a customer hits 'I agree'. I don't know PHP much. Can someone help step by step, please?