I am trying to add new sites, but I am so confused

Hi,

I am trying to add new sites, but I keep getting an error message when I do. I am trying to set up an Etsy style website and have wordpress configured for sub-domains. I am using MarketPress and FrameMarket. Also, I am getting an email saying it has been set up successfully, but when I click on the link provided in the email it gives me an error.

Thank you!!

Emily