If you notice up in the top right header of all pages, there is a 'Log In' next to a person icon. The benefit of setting yourself up with an 'account/member profile' is that you can store your payment info into your account, have your delivery address on file and change if necessary, and keep a record of your order history, so you can refer back to it if necessary.
It is not necessary to create a profile in order to place an order, but it does offer some value for your ongoing order and delivery history.