If you use a commercial theme or plugin and need support, please go to their official support channel. In order to be good stewards of the WordPress community, and encourage innovation and progress, we feel it’s important to direct people to those official locations.
http://diythemes.com/
the image is located here:
http://www.lasalonbianca.com/wp-content/uploads/2013/12/header5.jpg
if you have access via FTP or cpanel, you might be able to replace that with a new image with exact the same dimension and name;
or use the ‘media’ uploader in the dashboard to upload a new image, and then change the image url in this style near the end of /custom/layout.css of your theme:
/*—:[ custom header image ]:—*/
#header { height: 10em; padding: 0; background-image: url('http://www.lasalonbianca.com/wp-content/uploads/2013/12/header5.jpg'); background-repeat: no-repeat; background-size: 95.6em 10em; }
as you site seems to be using a commercial theme, this forum here connot help with details;
http://codex.wordpress.org/Forum_Welcome#Commercial_Products
