Non-teaching staff (office, librarian, warden, transport in-charge, accounts) are added by the admin and manage the operational modules. You are invited the same way a teacher is.
1. Get into your account
Open the invite email and click the link to set your password (Accept Invite).
No email? Ask the admin for the School Join Code and use "Join a School".
2. Modules you may handle
Library: add/catalogue books, issue and return them, collect fines.