After you create a pool, then you can enter the brackets.
You only need to enter 15 winners for each bracket because you start with the elite eight. This app doesn't need to know the details of the first two rounds, it just needs to know how many points each bracket has after the second round.
For each bracket, enter the points after the round of 32. Then choose the winner for each spot from the dropdown box.
If somebody else in your pool also has this app, then there is no need for both of you to enter the brackets. Once one person has entered all the brackets they can export them as an excel file. Then they can send them to anyone else who has the app and they can be easily imported.
To import brackets, first create a pool and click save. Then click the 'Import Brackets' button.