When creating an new agent account a PIN can be specified as well as a password.

From the setup -> agents page scroll to the bottom to get to the add agent page.

Along with name, email and password, the PIN can be specified at this point

Then click save to add the user.

If an agent has forgotten a PIN or it needs to be reset this can also be done via the setup -> agents view.

Select the agent in question and click the edit button

Enter the new PIN to be used

Click save