This tutorial shows you how to set up Email Exchange with your iPhone or iPad for iOS9 or older versions. The tutorial focuses on setting up an iPhone, but the settings are similar on an iPad.
Make sure you've created your mailbox in the Exchange Manager before setting it up.
If you have, then continue below.
Setting up Email Exchange on your iPhone / iPad for iOS9 or older versions
If you are using a different iPhone iOS version, you may click on the links below for the corresponding tutorial: