If you wish to use a verify Email and verify the VAT Number use: the following files:
http://www2.noc-ps.com/dl/blesta-3.1-signup-form.diff
http://www2.noc-ps.com/dl/blesta-3.1-signup-form.sql
Provided by Max at Noc-PS.
If you aren't sure how to do this you need Linux then use: patch -p1 < blesta-3.1-signup-form.diff
If you don't have patch, then use yum install patch -y
you will need PHP Soap for the VAT validation you can get it here: yum --enablerepo=remi install php-soap -y
Find out more here: http://www.blesta.com/forums/index.php?/topic/2013-registration-form-vat-number-and-e-mail-address-verification/