that is the way express checkout works,
User goes to paypal to set the billing and shipping details, paypal directs the user back to your site. the shipping is calculates and the user can either submit the order to have it processed or cancel.
that is the experss checkout work flow.
for your Premiere request, Ray handles the Premiere support, he will be in touch later to set the appointment.
Login: is the login email address for your paypal account, the other values are provided in your paypal account under the details for payflow link