Due to cache, you need to wait some hours until this name server changing takes effect. While you wait, create a simple web page in a file named as index.html and upload it to your example.com bucket. When the cache is refreshed, you can see your webpage up and running typing your domain name.
I've bought my zanon.io domain at GoDaddy.com, so this tutorial uses their control panel to show how to configure your domain. However, since all domain sellers let you change your name server values, the control panels are different, but you need to make the same configuration.