You can't relocate the REGISTER & CANCEL button at the of the fields with ease. You need custom coding modification in the template override file (actually you should create a template override file first and then put your custom codes in it -- to avoid modifying the Virtuemart Core Files)
You actually should use this URL below for "registration":
piabarile.com/customer-care-2/account-settings/editaddresscartBT?tmpl=component&flexible=register
That is the page that is being styled by SportMart. This page, on the other hand,
piabarile.com/customer-care-2/account-settings is the official Virtuemart Login page and is not being styled by SportMart by default.
If you insist on modifying this page:
piabarile.com/customer-care-2/account-settings and locate the REGISTER-CANCEL buttons at the end of the form, this change is considered as 100% custom modifications
(because you want to change how the things work/look) and unfortunately we don't provide free support or step-by-step instructions for custom coding modifications.
You may purchase premium support:
www.flexiblewebdesign.com/premium-support
and let us take care this modification for you directly on your website though.
Regards.
Support