That link describes putting a link in your theme. He just happens to want it to point to coppermine. Lets examine the link shall we?
<a href="this is where you put the link">', ($settings['use_image_buttons'] ? '<img src="' . $settings['images_url'] . '/' . $context['user']['language'] . '/this is where you put your image" alt="alt text for image" style="margin: 2px 0;" border="0" />' : 'Name of your link here'), '[/url]', $context['menu_separator'], '
However, this will be slightly different depending on which theme you use. But since you wont tell me I can't give you the exact link.