This page does not have sidebars. You only have content part. You can manage this in a Visual Mode.
This custom block is created in Admin Dashboard. You don't need to edit any html / php files to create new blocks. Everything could be easily created in admin panel.
You can create several types of blocks including Smarty, HTML, Plain Text or even PHP. Check Admin Dashboard / Content / Blocks management page.
Subrion is a free open source content management system
that allows you to build websites for any purpose. Yes, from blog to corporate mega portal.
It's done to focus on the content management process. Start it hassle-free within just a few minutes and take care of the content. It's easy!
Forget the hours of programming simple things. Use Subrion framework API to add extra stuff using hooks, plugins, & packages.