Change image links

Hello everyone. Extreme Drupal newbie here. I’m really a graphic designer but have been thrown into this and am very lost, so please excuse my ignorance. If you visit the below link, you will see a map with dots on it. When you click an area, it takes you to another “page” (I’m aware Drupal doesn’t really work in pages). I know how to go into the FTP and change the images (for example, to take dots off the map) but how do I change where the images link to? I have looked everywhere and can’t find them. I appreciate any help you can give. Thanks!

http://www.ascoworld.com/

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