Can you add a screen shot of the error you see that won't let you add a Submit button until you set up email Notifications? That is not a requirement to have a Submit button so I am not sure what you are seeing.
Email Notifications are a feature in the paid level subscriptions. Here are some instructions for how to add another person to the notification, but it covers setting it up for yourself to recieve as well: http://forums.adobe.com/docs/DOC-1424
Are you using FormsCentral in a desktop application that came with Adobe Acrobat XI or in a web browser?