You can choose to set up a subscription order when you are on the product page or in the shopping cart.  

Once you are on the product page, it will initially be set to Subscribe & Save. You will see a drop down menu for you.

Click on the arrow and select the frequency with which you want the product to be delivered - you can choose different intervals between weekly and once every twelve months.  Don’t worry, if you find that you want to amend the frequency at a later date, then you can change this under "My Subscriptions." section on the website at any time.

Once you have selected your frequency, then click on "Add to cart" to proceed to checkout and place the order.  Your product will now be dispatched at the frequency requested.