We only provide code for you to store custom information with a product. If you need to display that information on the store front end then you need to then reference your meta keys and display them on the relevant part of the single product pages. As this is theme dependent we haven’t written any auto code to display these. The general thing is, open the relevant template file and see which actions are called where and then hook into that action to display the meta key you’re storing.
Here is a reference for the actions.