You can save your online account as an app to your phone to easily access it later. How to do this will vary depending on which device you're using.
If you're using an iPhone or iPad:
On your device open Safari and navigate to my.oakbrook.com. Press the 'Share' icon and select the 'Add to Home Screen' button. Tap 'Add' and you'll see the app saved on your device.
If you're using an Android phone or tablet:
On your device open Chrome web browser and navigate to my.oakbrook.com. Press the dotted menu button, find 'Add to Home screen' and tap 'Add' for the app to appear.