This calendar opens from the private link an officer texted you. Open that link again — it signs you in automatically, so there is no password to remember.
If the link stopped working, it was probably replaced. Ask an officer to send a new one.
Add these shifts to your phone calendar. Subscribe to this link in Outlook, Google Calendar, or Apple Calendar and your shifts show up automatically. It is tied to you — don't forward it:
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Whole department: —
Each weekday box is a 6-hour block worth half a shift; each weekend box is 12 hours worth one full shift. Weekday mornings (6 a.m.–noon) are never staffed.