1. Launch your web browser and type your domain name, followed by '/wp-admin/', into the address bar, then press 'Enter.'
2. Type your username and password into the displayed text fields, then click 'Log in.'
3. Click the 'Editor' link under the 'Appearance' menu on the left side of the WordPress dashboard.
4. Click the 'custom.css' link on the right side of the 'Edit Themes' page, under the 'Styles' heading.
5. Click to place your cursor at the end of the last line of the 'custom.css' document, then press 'Enter' to create a blank line.
6. Type 'img {' and press 'Enter' to open a CSS statement that affects all images displayed in the Headway theme.
7. Press the 'Tab' key to indent, then type 'border: none;' and press 'Enter.' This line of code sets the 'border' property to the value 'none' for all images.
8. Type '}' to close the CSS statement.
9. Click the 'Update File' button at the bottom of the screen to save the changes to the 'custom.css' file.