If you have purchased Clicface Trombi Standard with more than 50 contacts, you will receive by e-mail a serial number to unlock the number of people, which is limited to 50 by default. The e-mail containing the serial number is sent within the next 48 hours. When you have received it, you can enter it under the Number of persons tab:
This serial number is different from your license key, which is required to get the automatic updates.