You can browse the categories listed to the left, then scroll down the item list offered to find the product you need.  Select your product by clicking your 'Add to Basket' button.  When your shopping is complete, you can view the contents of your basket by clicking the 'Basket Contents' menu option on the menu bar.  If you are completely satisfied with the items you've chosen, use the 'Check Out' feature to select the payment option and shipping method that best suits your needs.