No Sidebars
This page does not have sidebars. You only have content part. You can manage this in a Visual Mode.
Custom Block
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.