How do users access Free sites

Multisite - marketpress - gridmarket - easy blogging - blog templates.
All sites are stores under a global homestore.

Am unable to move forward as I cannot seem to be able to allow..
1 - Free site (says they are default) however when user signs up and activates the account they are taken directly to the
Pro-store/?bid=44
Link of the home store and cannot move past till a purchase is made..
ie: choosing the admin dropdown simply loops back to the purchase page..
Have I missed a setup step?