I am in the process of signing up to the Amazon affiliate program. Now, I've encountered the following message on the "Your Websites and Mobile Apps" page. Please note: This application is only for the Amazon Associates Program in the US (amazon.com). You will need to apply separately for each international Amazon Associates Program. I really don't understand this. I can't find any other page where you would apply if you live in Europe. What does it mean and do I need to care about it?