How to get users to post and sell products in marketpress

I have multisite and marketpress installed. My problem is I am unable to get registered users to upload and sell their own products in my store. They dont have option of adding new product in their dashboard when they sign in. I have gone to Admin Dashboard under Network settings >Registration and checked the option to allow registered users to create new sites but still cant get users to upload and sell their own products. What am i missing?