If you want just a few pages on your website on SSL, just one page not on SSL, this plugin offers this possibility. In the settings you can add pages, posts, or any other post-type or even custom post types that you want to be on SSL.
This plugin needs to be installed instead of Really Simple SSL Nulled , and is not meant to be an add-on. You can take a look at the instruction video to see how the plugin works. Take a look at the demo site to see how a site can switch between SSL and non SSL with the help of this plugin.