On the Active users page, choose the user whose administrator role you want to change. The properties page for the user opens.
Next to Roles, choose Edit. If you don't see the Edit button, then you don't have global admin permissions and can't assign admin roles to other people. Ask a global admin in your business to assign roles for you. In a small business, the business owner (the person who purchased Office 365) is a global admin. In a large business, key people in the IT department are global admins.
Choose Customized administrator to see a list of roles we've customized for you. For a description of each role,