I have created a form and I want to put a field that peopel can click and the form will automatically attach to an email with the email address pre-filled

Create a button. Go to its Properties, Actions tab. Add a new Mouse Up command with a "Submit form" action.

As the target URL enter "mailto:me@server.com" (without the quotes, using your own email address).

Select the option to submit the complete PDF file and you're done.

It should look like this: