The button Commander / Order and "Add to the basket" are used to put a product into the caddy.

At the page Détails de votre commande / Details of your order :
The quantities placed in the caddy are of 1 per product. You can modify it easily.
Click on the cell Prix Total TTC / Total Price TTC to indicate the prices.
Then, click on the button Commander / Order.

At the page Passer votre commande / Order :
Click on the country of destination, on the local currency and on the transport fees. After you have clicked on the total transport fees in the local currency, those cases will be filled in correctly.

The confirmation of your order will be done with the button Commandez / Order at the end of the page.

Finaly, you will have to indicate your coordinates and then order.