I need to be able to edit the submission button to point to client emails - where can I do this?
You will need to share the form with your clients so that they can opt-in to receive email notifications. Share the form to them as Reader so that they don't see the Design Tab nor the Distribute Tab. They will have access to a very limitted Options Tab (to turn on notifications), the View Responses Tab (to see the data) and the Summary Report Tab. Once they create their (free) account, confirm their email address and turn on notifications they won't have to log in FormsCentral again (unless they want to view the data) and will be receiving email notifications.
Note the FormsCentral will only sent email notification to FormsCentral subscribers who have access to the form. This is to make user people can opt-in and opt-out about all these emails that can be sent to their email account.
Instructions on how to share the form can be found here :
Instructions on how to turn on notifications can be found here :