Okay, it’s official. I do NOT know how to do this! I wrote a veritable book in my “About” section and have not been able to figure out how to edit it. I found the “about me” post and modified that but alas it did not modify the “About” section on my front (home) page. Thanks in advance for your help!
You can easily fix this. Go here > Appearnce > Widgets and place a Pages widget at the top of the sidebar. Save & Close. As you already have the About text on static page putting the Pages widget in the sidebar will provide a link to access it with.
Click and delete the text widget with the About text in it. View the front of the blog. Click the link for the About page. That should do it.
I don’t see any “About” page on your blog. In fact there appear to be no static pages at all. So before you go ahead with timethief’s solution, make sure you do have a static page called “About” and that you have a backup of the “book” in your text widget.