...

The default theme applied when forms are created in  has a submit button located at the end of the form. The forms designer lets you easily add additonal submit buttons  in a special area at the end of a form. 

You  You can use the following JavaScript to display an extra submit button at any position on your form. Add a trigger control to your form and set auto-submit in the CSS Class property. Now you can use this trigger control as your Submit button and place it anywhere on your form. 

var CustomEventHandlers = {
   submitEl: null,
   setup: function (el) {
       if (CustomView.hasClass(el, 'auto-submit')) {
           FEvent.observe(el, 'click', this.autoSubmit.bindAsObserver(this, el));
       }
   },
   autoSubmit: function (evt, el) {
       window.setTimeout('CustomEventHandlers.doAutoSubmit()', 2000);
   },
   doAutoSubmit: function () {
       SubmitView.doSubmit("Submit");
   }
}

Continue/Finish button on top of the flow

...