How do people buzz the door open without checking in?

If you allow employees or pick up people to buzz the door open without checking in, how to do so depends on whether they are an employee, pickup person, or both. Employee or a Pickup Person (but not both):

Act like you are going to check someone in, but instead of selecting a person choose Finish and say OK. The door will open after selecting OK.

then

Person is both an Employee and Pickup Person:
The door will open when you choose Cancel (or Exit) at the opening screen where you decide whether you’re acting as a pickup person or employee. The Exit button will only be shown if you have already gone to the authorized pickup or employee screen.