5.1 Contact Page
Navigate to the Pages and create a new page named "Contact Page" or whatever you want to call it. About page uses "Default Page" template from the "Page Attributes".
5.1.1 Top Image
Navigate to the Pages and open the page you created "Contact Page". To add the image as a background just upload the featured image. Size of the image we used in the live demo is 2600 x 400px. It will pull page title automatically.
5.1.2 Content Part
All you need to do is to add content inside the editor.
This page uses Jetpack contact form and it is styled for Contact Form 7. You are free to use any other plugin.
5.1.5 Default Sidebar
Navigate to the Appearance > Widgets and inside the Default Sidebar drag and drop your widgets.