hi I've been asked to help a friend using the atahualpa theme.
It's a 3.7.3 install
the site is http://libbypage.eu/
I'm looking at how/where you are looking to put the code to get a 800x300px image in as the header.
I have uploaded to the correct location via ftp /wp-content/themes/atahualpa/images/header/ and now am looking to simply get it into the site. If anyone can direct me to this most basic of threads i would be incredibly greatful.