How do I make these changes to my homepage on Blogs MU?

How do I change the header on Blogs MU? I tried to upload a photo but it doesn't seem to be showing up when I visit my page. Is there a way to get rid of the Blogs MU logo and make that space my own? Also, while I was able to figure out how to change the text to the right of it, how do I change or delete the photo of the computer on the demo? New at this. :slight_smile: