Editing sidebar text

I feel like I’m missing something really simple and will feel quite stupid after I get the answer to this, but poking around in my dashboard and searching this site hasn’t helped.

My wordpress blog (using the default theme) has a sidebar on the right side that includes a link list, etc. But at the very top there’s a section with the header “About the blog owner:” and a little description I wrote about a year and a half ago. I’d like to update the text in that “About the blog owner” section, but I cannot remember or figure out where I go to do that.

*headdesk*

Help?