The Staff page

Staff in the sidebar is your team directory: each person's name, roles, certifications, languages, contact details and status. To add or change someone, use Manage in Settings, which opens Settings → Users and permissions. That is also where you edit their certifications.

Job roles like Instructor, Divemaster or Captain are set up under Settings → Users and permissions → Staff roles, with Add staff role.

To see who is working when, open Trips and choose the Staff view. You put staff on a trip in Schedule a Trip.