When do I have to pay ? What do you mean by ‘Free Trial -> Buy Subscription’ ?

You register and get a free trial to start, no strings attached. We do not ask you for any payment related information at sign up. Your free trial is valid for a couple of days as advertised on the website. You can access most of the functionality during the free trial. Once your free trial is over, you need to buy a paid subscription to access your account.