connexions

Prestashop 1.7.4.2 just completed site running tests when I click on add to cart nothing happens and does not show in cart icon

I have printed off instructions and it says click on add module and new window will appear allowing you to enter source url or file but this does not happen

I have purchased facebook tracking module from prestashop addons when I click add module nothing happens in the way of being aloud to specify url or upload purchased module I am a total newbie

I can get about us to appear above box but cannot place any text in block