Step 1: Creating a Page
First, go to the Pages > Add new, after that fill the title input field, I suppose it will be «Blog», and save the page.
Step 2: Customizing template for About us page
Go to Templates and Create new Template like this:
Use the Text Block to add the description and others block information
Step 3: Assign template for Page
Go to Page list and open the "About us" page that you have created, Template Settings in the right side