[SOLVED] Atahualpa2: Changing the header, novice style

Hi there.

I am new to wordpress, so please be patient with this elementary question.
I have the following direction for changing the header in Atahualpa2:

"Upload your own header images: All image file names must have the extension ".jpg", ".gif" or ".png" but the file name itself doesn't matter: "jhkrekjfk7.jpg" will work. Upload the images to
/wp-content/themes/atahualpa2/images/header/"

The issue is how do I get to the upload location? I have a sense that this is a simple answer, but it is eluding me.

This blog is a page linked to my website's homepage. The links were set up by a web consultant and the website is hosted by an external webhosting site.

Can you provide any insight? Please?

Aprilp