How do you redeem a Nintendo Points card?

Answer 1

From Nintendo's support pages:

To redeem a Wii Points Card: # Access the Wii Shop Channel through the Wii console's Channel menu. # If this is your first time using the Wii Shop Channel, read the User Agreement and click "I agree" if you understand and agree to the terms. Click "Okay" after reading the Wii Shop description # Once on the "Welcome to Wii Shop Channel" screen, select "Start Shopping." # Click the "Add Wii Points" button. # Select "Redeem Wii Points Card." # Scratch off the silver area on the back of the Wii Points Card to reveal the Wii Point Card's activation number. # Enter the activation number into the space on the screen. # Select "OK" to continue. # If you want to redeem the card, select "Redeem". # Once the purchase is processed, a confirmation screen will appear indicating that Wii Points were added to your Wii Shop account.

How to use Nintendo DSi Points and download DSiWare itemsThe Nintendo DSi Shop is available by selecting the Nintendo DSi Shop icon from the Nintendo DSi main menu. * On the Nintendo DSi Menu, use the stylus to select the Nintendo DSi Shop icon. * Select "Start Shopping" to reach the Nintendo DSi Shop main menu. * Select "DSiWare," then select from the following options: ** Free Search for free software ** 200 Search for software that costs 200 points ** 500 Search for software that costs 500 points ** 800+ Search for software that costs 800 points or more ** Find titles Search for software by publisher, genre, title, etc. * A list of titles matching the selected criteria will be shown. * Select the desired game or application, then select "Download" or "Free," then select "Yes" to begin the download.