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If the person you want to promote to an Administrator is already a member of your account, you can click Membership, lists, sub-groups & permissions on your home page, find the person in your member list and click on their name. Click the Manage Membership button that will appear just under the person's name, select their new Role and click Save Changes.
If you'd like to add a new person with an Administrator role, click Membership, lists, sub-groups & permissions on your home page and click the Add member(s) button down the left. Enter the person's information and select their Role to be Administrator.
In either case an email will automatically be sent to your new Administrator letting them know of their new Role, how to sign in and of some helpful links to get them started.
Hope this helps!