In Blog Single Settings, you are able to setup Sidebar Single Post Layout, choose Blog Sidebar ….
 Sidebar Single Post Layout: You can select Right / Left sidebar or full page (without sidebar). And when you select Right / Left sidebar, you are able to choose sidebar in 
 Blog Single Sidebar: There are some availabe Blog Single Sidebars that you can choose. And to design these sidebars, please negative to Appearance > Widgets
Here you can see the complete widgets when you choose Blog Single Sidebar  is Widgets Area
 Add the share item networks to make them have the button on blog post
 Turn ON/ OFF to Enable / Disable Related Blog block. If you turn on, conitnue to add the element in