Should you wish to complain about any aspect of school life, the most direct method is to arrange to speak to Ms Archer or another member of the school leadership team.
There may be an occasion when you are unhappy about something that has happened in school when you need to speak to the class teacher. They are always your first port of call.
Ms Archer is always available to any parents who need to ask or comment on any aspect of school life - often it is better to make an appointment and talk something through before it becomes a problem!