Well it's as simple as it sees, just type "change manager" and follow the instructions.

Reply with the username of the person to whom you reports and if you don't reports to anyone just reply with NA

Please note, the admin AttendanceBot can lock "change manager" access to restrict employees from updating/changing their managers by heading to their settings panel by typing "settings"

Once enabled only Admin/HR can update managers of other employees by typing  "change manager @username"