The browser security error occurs for several reasons. If your browser says that the web page where your form is hosted is unsecure, check if SSL encryption is activated for your form. Go to the section Publish and, at page top, check the option Secured SSL if it is unchecked.
If the browser security error persists, make sure that the images in your form have a secured URL. Secured URLs start with https, instead of http.
Here is a list of the most frequently asked questions. For more FAQs, please browse through the FAQs page.