I'm not sure if the program has functionality differences between Mac & PC. I'm PC - Make sure that you are using the form tools. Double click your submit button to get to its properties. Under Actions tab find out what is there - is it Submit Form or Run a JavaScript?
If it is JavaScript, click to highlight Run a JavaScript and click the Edit button at the bottom of the window. You will see the email address there. All you need to do is delete the wrong email address and type in the right one. Click OK, then click OK again to exit the properties.
Hope this helps!
I tried to take it one day at a time, but a whole bunch of them attacked me at once!