Several of our themes - such as Bone, Mute and Tomahawk - have a special 'hero' block at the top of the blog area to write some introductory text or insert a favourite photo or image.
To start click the 'Edit theme' icon on the top right of your logged in home page to open the edit side panel.
Look for the panels named:
Show hero area - this turns the feature on and off
Hero text - this is where you can type some words you want to appear in the hero area
After this initial step to turn the feature on you can then experiment with the settings such as overlay colour, overlay strength, upload an image, height of hero, hero text colour, size, alignment etc, etc.