Really Simple E-Commerce plug-in does not appear

I just installed Wrordpress with no problem. I also installed and activated Really Simple E-Commerce Plug-in. I set up the payment gateway with authorize.net. I created a product to list, and selected a page for the cart and check out information. But none of the e-commerce functions appear on the designated page–no product listing, no cart, and no check out. Can someone help?

Thanks