When you see "You don't have access"
A greyed menu item, a page you open without permission, or a button that is refused shows: You don't have access to this screen or action. Click Request access, add a short note if you like (for example why you need it), and press Send request. If you already asked, you are told the request is still waiting.
What the school owner sees
The owner opens the Owner App → Approvals → Access requests. Each card shows who is asking and their role, the screen or action, what that access lets them do, a severity (Low = view only, Medium = add or edit, High = delete, fees, payroll, money, users and privileges, or sending messages), your note and when you asked. The owner presses Approve or Decline. The History tab lists every decision, who made it and when.
After the decision
Approve gives you exactly that one permission, for your own campuses. You get a notification in the Bell at the top of the EMS: Access given, with a link that opens the screen. A decline also notifies you. In the Admin App the decision shows when you next open the app. Only the school owner can decide; school admins and the Admin App cannot. You can also ask an administrator to change your privileges in Core Settings → Users & Privileges.