How do you buy things on Amazon?

You will need to create an account and then hook it up to either a pay-pal account or a credit card OR wait till you find something you want to buy and 'check out' then it will ask for details there. When you do shopping on Amazon, make sure you did research first, and find out whether there is any coupon or promtional code. Or you can try third part discount search engine to find your great deals before purchasing.