In the Library palette's Standard tab, you'll find many different kinds of buttons: (Regular) Button, Print Button, Email Submit Button, HTTP Submit Button and Reset Button. The (Regular) Button, once on the form and selected, can be made into a submit or execute button.
If you're wanting to have form data submitted to an email or HTTP site, I would suggest using the email or HTTP submit buttons, respectively. Just fill-out the properties in the Object palette.
If you need to do some custom steps (pertaining to this "action" you want to add), you can do so by adding script via the Script Editor. Select the button then select the event (action) you want to add script to in the Script Editor's
Show drop down list.
Stefan
Adobe Systems