Follow these steps to setup your Exchange ActiveSync account your iOS device:

Tap Settings > Mail, Contacts, Calendars > Add Account > Microsoft Exchange.

Enter the information in the    fields below, then hit Next:

Your iOS device will now try    to locate your Exchange Server. You will need to enter your    front-end Exchange Server's complete address in the Server field. 

Choose which content    you would like to synchronize: Mail, Contacts, and Calendars. Tap Save    when finished.

 Note: To modify your exchange settings, Tap Settings > Mail, Contacts, Calendars, select your Exchange account, and tap Account Info. 

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