How to change text on register/forgot password form


I have installed the plugin "WP Email Login" and this is working great with the Protected Content Plugin.

I would like to change the placeholder that is displayed in the Protected Content login form from "Username" to "Email Address".

Also, on the Protected Content "Lost your password?" form the placeholder is currently, "Username or Email Address". How do I change this to just, "Email Address"?

Thank you,