How do you earn stars on club Nintendo

First of all you have to buy a Nintendo product and look through the case until you find a leaflet saying something along the lines of 'Join Club Nintendo today!' open it, scratch away the silvery stuff and you should find a code. Log into Club Nintendo and click on 'Register Product'. Then all you need to do in type in the code- ALL IN CAPITALS- and you should be given the stars which you can spend on the website.