I recently bought a new book and my nook wont let me view it it keeps telling me to put in my name and credit card number

In order to start using your Nook, you'll need to register it through the Barnes & Noble website - I've shared the steps below. Once you've registered it, you will be able to start purchasing and reading books. Please note that you will need to set-up a B&N.com account first. That is done on BN.com and simply click "new user account." Once you have set that up, follow the below Nook set-up steps.
NOOK Set-Up Steps

1. Charge your new NOOK 3G or NOOK Wi-Fi for 3-hours from a wall outlet using the Power Adapter and USB Cable packed at the bottom of your NOOK box.
2. Turn on your NOOK by pressing the power button at the top.
3. Connect to Wi-Fi.
4. Register your device by entering your BN.com account email.
5. Tap the down arrow button in the lower right corner of your color touchscreen.
6. Enter your BN.com password.
7. Tap Submit