2010 – send email to a group of user using three state workflow

I’ve created a request form using a custom list. And I also have added a three-state workflow to send an email after a new item has been created in the list. For now, I can only send the email to the requester and also another one user. My problem is, I need to send the email to a group of users who is the administrator of the page.

I can’t use Sharepoint Designer or MS InfoPath due to permissions are not granted.

How can I do that? Is it possible?