If your browser warns you that some of the content on a web page is not secure, that means a SSL page has some content that is not transfered in a secure way.
On our site, you should not see this warning at all since all content on our secure pages is transfered in a secure way. But some browsers may give you this warning by mistake. If so, please choose "don't display non-secure content". Therefore, your page will stay secure and you will not lose any content.