You dot need to fill in the form function contents since you already have the universal Email behavior on the page. You only need to set the form contents the first time that you run form builder.
after that, to edit the Universal Email settings, double click the universal email server behavior on the page.
As for UE not redirecting after sending the email, that is because you have changed the name of the submit button on the page, but left the trigger for universal Email to use the old submit button. If you rename the submit button, you will need to edit Universal Email and reset the trigger.
I commented out the go to page at line 40, and added code to dump the session contents to the page at line 620, this is just for testing so you can see the email results, you can uncomment the go to setting and remove the var _dump later.
the email results are still showing that the SMTP Server authentication is failing. double check with the host the correct email address and password to use for authenticating with the SMTP server.
for the error you are getting, go to Window -> Work Space layout -> Reset '<your layout name>'
and Delete the Dreamweaver Cache file from the users configuration folder: