CSS Form Builder does not offer the ability to add Like Entry validation to text fields that you create in your form, you need to add this after the form is created.
This is because in addition to adding the server side validation, it is adding Client side Spry validatin that does not offer a like entry option.
To add Like Entry validation:
double click the Server Validation server behavior.
From the Validation type list, select Like Entry.
Click the Lightning bolt next to server variable and select the email address form element. Click the plus button, in the next screen, select the re enter email address form element.
As for the message from Enom, this instance of Universal Email uses the Mail mail object, use Pear Mail for SMTP instead as I stated in your other thread.