I'm writing this question so I can also provide the answer, because I couldn't find an answer online anywhere.
The goal was to edit the password change page to put the complexity requirements on it so users know what's expected when they change their password in OWA (Exchange 2013). I wanted to customize a web page somewhere to tell users what characters they needed to put in their password to be accepted when we have the complexity requirement turned on in the default domain policy. (The extra words are to help search engines find this when people are searching for a solution to this.)
All I could find were outdated instructions for 2010 and 2007, which did not work.
Answer forthcoming...