Apple ID Question [View all]

Awhile back I changed my Apple ID on my computer to reflect a different email address. I thought I did the same thing on my iPhone, but my phone gives my old email as my Apple ID. I don’t even remember my previous password and now I’m worried that if I try changing my phone ID and password I’ll somehow lock myself out of my phone or otherwise mess things up.

Any insights and/or advice would be appreciated.