You have to log in (you have to be registrated) and then on the left side there is colume which is called subscriptions. With a blue text is writen Access to download. And there are the different possibility. The cheapest one is the premium2. You have to pay 2 euros and you will got an access for 5 days. Each day you can download 50 MB.
You can pay by PayPal or by Creditcard or the most easier way be SMS.
BEst Regards