You can order online 24 hours a day. Just select the product you want and press the "buy now" button on the product page. The button is found at the bottom right of the page.
This puts the product into your 'basket'. Add as many products as you like in the basket.
Then you are ready to complete your order go to the basket page (a button to the basket page always accessible on the top left of any page).
Select which delivery option you want. You will need to click on the logo on the courier you want to use.
Check the total price and if you want to go ahead then press the "Proceed to Checkout" button.
The following screens will ask for your email address, create password. You will then be asked for a delivery address (you can enter a different delivery and invoice address if you so wish).
They you asked if you want to pay with paypal or a card. Once you have paid with a paypal or a card you will be given a receipt (a receipt will also be sent via email).