PRO SITES SETUP ISSUES.

I am trying to setup Pro Sites Plugin and I have some issues. I can't find the page to display for signup at the front page for my users to create their website. The checkout page can not be found even after several savings of the settings page. It gives the following message:
There was a problem finding the Checkout Page. It will be created when you save the settings on this page. Please I need a direction on this.

Thanks