PINs are activated on your NarcBox account by default. You can change this online by going to the Settings page, and clicking on the Security tab. 

Under 'NarcBox Security Profiles', you will see the different methods that you can select to allow access to the NarcBoxes on your account. By simply checking the RFID box, you have enabled RFID cards to access the box. You can keep PINs active as well, or turn them off and use RFID only. Any mix of methods is allowed, although if you have selected that 2 people must be present to open a box, it must be two different people. One person can not use their PIN, and then use their RFID card and gain access to a NarcBox.