You have a look in the Custom Heading Options in the page edit window. If you have the sample data imported, you should see the custom HTML there which has the Blog title.
I’m talking about each individual post. I wouldn’t think I have to change that section every time I post a new blog OR worse yet have to go back to each individual post to manually change the header text.
I misunderstood your query. Pls try to change the value of the option “Tagline for Blog Posts” in Header tab of theme options and see if that helps. Thanks