Having multiple admins

I have three people I want to make admins. I've used the user area to make them admins and added them to the wheel group.

But when I get the authorization from this step:

[mcarter@liandra ~]$ epiphany

bash: epiphany: command not found...

Install package 'epiphany' to provide command 'epiphany'? [N/y]

* Running..

* Resolving dependencies..

* Waiting for authentication.. The transaction failed: not-authorized, Failed to obtain authentication.

It only asks for my authorization. How do I get it to list the other admins?

Michael