There is only one registered admin per site. You can share the admin password amongst your club members... many clubs do that.
The only real distinction of the "registered admin" is that the person's email address is used to send out notices of upcoming system updates and there is also an alias, admin-####@toastmastersclubs.org that maps directly to that person's email address. (How you use the admin alias is up to you.) Thus, mainly you should just set the registered admin to be the person's name and email address who will receive those communications. Otherwise, you can just share the password.
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