You can select to have the club66pro.com membership for 1-month to go with your Study Notes purchase. Select the option when you click "Add to Cart".
You will need to register an account at club66pro.com if you have not already got one. It is free and very easy to set-up. You can do this after you have purchased the Study Notes with the add-on.
Next time you log in to your club66pro.com account, go to "Order Modules" and you will see an e-voucher at the top of the page. You can click on the e-voucher any time you want in the future, to activate your membership. Your 1-month membership to the associated Module will commence automatically as soon as you activate it.