If you have a board with different task lists on Trello you can easily add it to your application.
To integrate your Trello board into the app refer to your app, choose Trello widget from the list of available features:
Then just copy your Trello board URL and paste it on iBuildapp.com. Do not forget to click on the Save button afterwards!
That's it! You see how simple it is.
You can find more information about Trello platform by visiting this website.