the homework was confusing hence my question to those with direct experience. I don't think you need to download the app on a laptop:
On your computer:
Go to directv.com/nfl and sign in using your directv.com username (your email address) and password. If you haven't already, you can create an account now.
On your mobile device:
Download the latest NFL SUNDAY TICKET app from the App Store or Google Play, then sign in using your directv.com username (your email address) and password. If you haven't already, you can create an account now.
On your game console:
Download the latest NFL SUNDAY TICKET app from the Xbox Live Marketplace or the PlayStation Store, then sign in using your directv.com username (your email address) and password. If you haven't already, you can create an account now.
Please note that if you download the app before the start of the season, you will have to update it to enjoy the latest features.
Plus there's this:
What happens after I sign in to NFL SUNDAY TICKET Online?
The NFL SUNDAY TICKET Online interface will load and a video stream of the RED ZONE CHANNEL® will automatically play in the video window if it is currently on-air.
And this:
Can I watch NFL SUNDAY TICKET online on my work and home computer?
You can watch NFL SUNDAY TICKET Online from any computer you want, but you can only watch it from one (1) computer at a time. Please remember to log off from your computer before watching it from another computer. Downloading large files or using peer-to-peer applications while watching video, for example, may prevent you from being able to receive enough data to maintain a constant video stream. Your viewing experience will be affected if our servers are unable to deliver data to your computer quickly enough because of network congestion on your connection. Turn off any other programs that are sharing your connection like other browser windows and email programs. You might also try restarting the computer to close other programs that may be running in the background.