Gill is correct, you need to use the snippet of code found in the FAA settings section > Marketing > Shopping Code Widgets > Embed Code
If interested, you can see the implemented code on my website here: https://www.philippreston.uk/philip-preston-photography-prints-f
The code needs to be inserted on the webpage where you want it to appear, to do this you will need to use your websites web page editor. If unsure how to do this, you will need to contact customer support for the hosting company that runs your personal website.