I need to create a solution that will be running on a computer (Mac) and I do not want the user to be able to exit the application.

It's really a very simple solution. It's for customers to enter their emails in so that we can add them to our email notification list. It's a retail store. Pen and paper don't work because we can't read them way too often.

So the solution will simply present a screen with one field on it "email" for them to type it in and click a "Save" button, which will present a "thank you" screen and then return to the "enter email screen".

I would like to remove the menu completely and have the solution restart if they click the close button on the layout. The only way to exit will be to enter a passcode in the email address.

I'm kind of a noobie so any help is appreciated.

I suggest you have a look at: Displaying databases in Kiosk mode.

Kiosk mode worked perfectly. Better than I expected.