When you sign up for Hushmail Business and you choose the Administration feature your primary account will be your administrator account. If you wish to add another administrator you can do so by contacting customer support. If you do not have the Administration feature enabled you can enable it by contacting customer support also.
Customer Support will require that you send either a digitally signed email or that you call them to make changes to your services. For more information on how to make changes to your Hushmail Business services see Making Changes to your Hushmail Business Services.