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
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?