If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your simple goal here is to make money by running a supermarket. You must first buy products to be stocked at your warehouse then put them in your shelves at the store. Just click on the shelves and put your desired products. Products also have expiry dates and if they're still in the warehouse,they will be wasted. You may also upgrade shelf capacity and star rating of the product to sell. Marketing also included. Good luck!