You can browse and shop for popular NOOK Apps™ in the NOOK Store™:
Open the Quick Nav bar, and tap Shop.
Tap Apps to view apps.
Select an app list by category or scroll through the suggested app picks shown in the apps home page in Shop.
Tap on an app to bring up the app's details page, and click on the Price button to purchase - it will display either the price or the word Free.
Tap Confirm - and the app will begin to download and install on your device immediately.
Once you purchase the app, it should download and install on your NOOK Color automatically. Please note that it may take a few minutes to download, depending on the size of the app and your Wi-Fi connection.