Hi there, I’ve recorded a short screencast to show you how to do this. Basically go into your wp-admin, appearances>theme settings and the top field you’ll see the option for the blog logo.
Click on the browse option, find the image in your media library and hit insert into post. You should now see the url for the image in the blog logo field. Hit save.
Screencast – http://screencast.com/t/vbga0lo6T