When the family assigns you a door code, Getting started shows the House entry code item. Watch the family's door video (I watched it), read and sign the House Access Acknowledgment — what the code is, that it is personal, when it may be used, coming and going, what to do if it does not work, entry records, lost devices, revocation and return — and Show my entry code reveals it for a short moment. The dashboard banner reminds you of the door.
The code is given when you are hired and revoked when the relationship ends. Comings and goings are recorded from your clock-ins and, with a linked lock, the lock itself.