How to Change the Header Size in WordPress 3.0

1. Log into the WordPress.org website.
2. Open the Presentation Administration Screen. Locate the 'Appearance' tab in the left navigation bar. Click the down arrow to open a drop down a list. Click 'Editor' from the drop down list.

3. Locate the link on the right side of the dashboard titled 'Stylesheet,' under the section title called 'Styles.' Click the link to open the CSS file for your website.
4. Replace the header tag #header with a larger number of pixels for the 'height.' For example, the CSS string may read: #header { height: 100px; width: 100%; }.
5. Click the 'Update file' button at the bottom left of the file editing box. Refresh your website to see the new header change.