How to change Password Reset screen?

I am creating a site with no username field, just email. And I am wondering how to change it so the password reset page doesn’t show up with “enter your username or email” and just “enter your email”. I have edited the password-reset.php file to change the text above the text box, but I cannot find where I need to change it so the words inside the box and in the red dialogue popup do not say username. It would love it if anyone can help me. Keep up the great work by the way, I just started using Ultimate Member and I am considering purchasing it.