Your Credit Card or Paypal account will be automatically charged after 2 weeks since the day you opened the trial account, unless you cancel the subscription during the 2 week period.
You will be notified by mail, five days prior to the charge, about the end of your trial, so that you can choose either you want to continue or not using the account.
Not taking any action, in terms of canceling the account during the 2 weeks of trial is considered your acceptance of using the product on a continuos basis, until you choose to cancel the subscription.