Use an Apple ID to purchase Project Plan app and download it to your iPad.
If you don't have an Apple ID, you can create one in App Store.
After downloading, Project Plan
is automatically installed in the /Applications folder, and the application icon appear in Launchpad.
Hold down the app’s icon in Launchpad until the Project Plan
icon start to jiggle, and then click the app’s delete button (x) to
uninstall the app. If you don‘t see a delete button, you can‘t uninstall
You can reinstall the app by viewing the App Store Purchases list and clicking the Install button for the app.