Wasted space on blogger blogs

Ms. Haiku

Please look at one of my blogs in the signature i.e., cookieempress.blogspot.com. If you have a blogger blog then you probably know what I'm talking about.

Look at all that wasted space on the left side, and even some on the right side. I looked at the code, but I didn't know what to change to either add an image on the left side, or just move the text so it starts on the left with a smaller indent. How do I change the margins in blogger? Or how do I add images to the left?