The second step in creating an account is called "Share Data." In this step you'll be able to choose which accounts you'd like your new account to share it's data with. Think about this as giving data, the next step will be which accounts your new account will take data from. You can also choose whether you'd like to share data with recommended accounts based on your parent account or choose accounts one by one from the list.
In order to save your changes you've made in this step, make sure to go to the Review tab and click save.