Hi,
This is not an easy task to do and require some custom coding changes. Unfortunately our free support doesn't cover any kind of custom changes.
The PHP files you would need to edit are these:
/templates/YOUR_TEMPLATE/html/com_virtumart/user/login.php
and
/templates/YOUR_TEMPLATE/html/com_virtumart/user/edit_address.php
But touching these files will give you some other problems, such as, redirecting the user to hompage as well from the shopping cart page (during checkout process) which is a bad thing, and you wouldn't want this.
Regards.
Support