How to add a second email field to a form
With your UsersWP registration or account form you may want to add a second email field.
To add a second email field, use a text field with validation.
Add the field, then open the advanced settings for the field, then open the validation option and add something like this
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$