How to integrate JFBConnect to joomshopping

Ondrej,
The first step would be to get a Facebook API key. We have step by step instructions for doing so in our configuration guide below:
www.sourcecoast.com/jfbconnect/docs/configuration-guide

After that, you should be able to add the JFBCLike or JFBCComments module to the menu items for your Joomlshopping component to display those features on the pages you want. Alternatively, but with a little more work, you could use the {JFBCLike} and {JFBCComments} tags in your component's extension. That gives a little more flexibility about placement, but you'd likely need to contact the extension developer to know where best to add them. We couldn't really help with that as we don't know the Joomshopping component structure to point you in the right direction.

Hope that helps get you started, and good luck!
Alex