To access a user's details go into People > Users then find the user you are wanting to add / change the PIN for.
To find a contact, go to Company > Address book > Contacts
With contacts and users, the page will look very similar, below we have contact details, for a user it will be a user details tab. On this tab you will find the PIN code field for you to input a 4 digit code.
Next ensure you click save at the bottom of the page for changes to take place.
For a User on the User details tab you will find a section called Site Services Pin, enter the 4 digit pin and click save.
