On our homepage, in the top right corner, next to the cart icon, you can click the account icon to access your account. That is, if you have an account ;) If you don't have one yet, and you click the icon, you can easily create an account by clicking 'Register'.
Another - probably easier - option is to create your account during the checkout process. When you're asked "How do you want to check out?", select 'Register' under 'New customer?' and continue to add your details. You'll then immediately be using your account to place the order.