The Manage Users page is a page for you to invite other people you would like to be a part of your DonorView account. When you invite users they have access to almost everything on your DonorView account. Users can create campaigns, surveys, etc. You can also grant admin access to specific users. Users with admin access have access to everything in your DonorView account including all the information on your billing page. Users who have not been granted admin access cannot access your billing page.