The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From The NPD Group:
The NPD Group has developed an online Journal that is designed to capture information in a new and different way. You will use your standard NPDOR log in and password to access the Journal (ideally each day) over a specified period to record what you ate and drank each day (both at home and away). Unlike traditional surveys that are typically completed at one time, you can log in to the Journal on and off throughout the day as many times as you like, when it is convenient for you. We encourage you to log in after meal or snack times to record your information while it is fresh in your mind. The information you and others share with us will shape the development of new food and beverage products that will eventually make their way to store shelves. We think you'll find the Journal to be an interesting experience.