By default, users can only log in to WordPress using their username and password. This can be a pain in the butt to users of your website if they forget their username and thus, they are left with no option but to do a password reset for them to get their username.
ProfilePress include a
log in with email feature which allows users to log in to your WordPress powered site with their email address instead of a username together with a password.
To activate this feature, click the Extras ProfilePress menu and activate it in Login with Email section.
Do not forget to click
Save Changes button.