At the top of all blog posts and pages you will see a header containing the post or page title as well as other meta data such as post date, post category and post author.
It looks like this on a blog post:
And it looks like this on a standard page:
You can change the background colour of this header colour so that it uses on of the 6 colours from the colour scheme you have selected.
On the right-hand side of the blog post or page editor you will see the Header background colour section that looks like this:
Simply click on the drop-down list and select the colour you would like to use. Each colour corresponds to a colour in your colour scheme with Colour 1 being the lightest and Colour 6 being the darkest.