Koresponsive replace with my logo

I downloaded Koresponsive and made a child theme but cannot see how to change their logo to mine. It’s probably easy but I’m fairly new to this. I used a different theme for another website before and the header change was fairly obvious, though.

I know people have used this theme. It keeps getting brought up as a great site but I don’t get it. Please help. I’m exhausted! Ha ha.

http://www.luxpunk.org

Joanie