How do i set up marketpress such that i can allow a network of websites to sell their products and t

according to the plugin's project page, it says that "MarketPress is also 100% WordPress Multisite and BuddyPress compatible - so you can use it to start your own Etsy or Ebay style network of stores… where you take a % on each sale!!!"

May I know how do i set up my Multisite such that I can start a network of stores and take a % on each sale?

I didn't see any obvious ways to do it within the MarketPress's admin? Am I missing something?