reset multi stepsForm.js (minimal form) and get back to the first step after settimeout

I'm using copdrops stepsForm.js and I modified it in some way. Everything is fine, but as I'm not familiar that much with javascript I couldn't make it back to the first step (first question) after the form has submitted.

this is the codrops script:

http://ift.tt/1juxrF5

and this is the modification I made to reset the form and get back to the first question(step) after being submitted.

http://ift.tt/1zBYQdo

and this is the modified javascript I used and also has been added to the end of codepen's javascript:

var theForm = document.getElementById( 'theForm' );

new stepsForm( theForm, {
    onSubmit : function( form ) {
        // hide form
        classie.addClass( theForm.querySelector( '.simform-inner' ), 'hide' );
        var messageEl = theForm.querySelector( '.final-message' );
        messageEl.innerHTML = 'Thank you! We\'ll be in touch.';
        classie.addClass( messageEl, 'show' );

        setTimeout(function(){
                form.reset()
            }, 2500);
        setTimeout(function(){
            classie.removeClass( messageEl, 'show' )
        }, 3000);
        setTimeout(function(){
            classie.removeClass( theForm.querySelector( '.simform-inner' ), 'hide' )
        }, 3500);
    }
} );

I really don't know how to force it back to the first question, because I'm unfamiliar with javascript.