This tutorial will show you how to change your header in WordPress. This tutorial assumes you are already logged in to WordPress.
Log Into Wordpress

1) Click Appearance.
Appearance In Wordpress

2) Click Header. Here we can see a preview of our current header.
Header In Wordpress

3) Scroll down. Click Browse to upload your own image.
Scroll Down

4) Or select one from the list to use.
Select One

5) Use these buttons to Remove Header Image or Restore Original Header Image. Click Save Changes.
Original Wordpress Header

The new header has been saved.

This is the end of the tutorial. You now know how to change the header in WordPress.
Change Wordpress Header