Download the Box for iPhone and iPad application from the iTunes Store.
Once installed, open the Box app and select "I have an account".
Next, click on the "More login options".
Enter your CloudID and tap the "Continue" button.
You will be redirected to the EID authentication page. Enter your EID and EID password and click the “Log In” button.
After successfully authenticating, you will be asked to create a passcode to access your Box documents on your iOS device. For security reason, it is a best practice to select a passcode that is not the same as the passcode you use to unlock your device.
Once you have entered and confirmed a passcode, you should be able to access your UTBox documents.