How can I minimize the iframe height of the form

I want to minimize my form because it´s to long could you please help me that I can scroll down the form on my page

I think the I-Frame code should be chanced but I don´t know how to do this.

The best size would be 670 x 670

<iframe id="JotFormIFrame" onDISABLEDload="window.parent.scrollTo(0,0)" allowtransparency="true" src="//german.jotform.com/form/50986939075371" frameborder="0" style="width:100%; height:1780px; border:none;" scrolling="no"></iframe>
<script type="text/javascript">window.handleIFrameMessage = function(e) {var args = e.data.split(":");var iframe = document.getElementById("JotFormIFrame");if (!iframe)return;switch (args[0]) {case "scrollIntoView":iframe.scrollIntoView();break;case "setHeight":iframe.style.height = args[1] + "px";break;case "collapseErrorPage":if (iframe.clientHeight > window.innerHeight) {iframe.style.height = window.innerHeight + "px";}break;case "reloadPage":window.location.reload();break;}};if (window.addEventListener) {window.addEventListener("message", handleIFrameMessage, false);} else if (window.attachEvent) {window.attachEvent("onmessage", handleIFrameMessage);}</script>

I hope you can help me

Thank´s for a quick reply Peter

P.S. The page is not online I´m just building it.

Please refer to the user guide -Getting-the-Form-iFrame-Code

You can adjust the height of the iframe in the given embed code

Please inform us if you need further assistance.

Thanks.