Go to settings icon shown on the home screen of your iPhone or iPad. Now scroll down and tap on "Mail, Contacts, Calendars" option.
Tap on the “Add account” option, now tap on the “Microsoft Exchange” option.
A new screen will pop up. Enter your MS Exchange email address, the domain, user name and password. Description is set by default but you can change that if you wish to do so .
Once this is done tap “Next”, iPhone will now connect to the MS Exchange server.
Once connection is established go back to “Mail, Contacts, Calendars” option, select Microsoft Exchange, here you can enable or disable synchronisation of your contacts, notes and calender with your mail account. Turn them on or off according to your needs.
These instructions should be relatively easy for you to follow but if you face any difficulties then you can start these steps over again from the beginning. Be sure to take your time so that you do not miss a particular step. You can also go online and get help from many different forums or websites that deal specifically with MS Exchange and also the Apple iPhone. There are many sites where you will find some excellent tips and tricks to help you get these settings done correctly. Remember that if you carefully go over all the previous posts on the forums you might find the solution to your problem. If you cannot find any answers then post your own question or query on a forum and you will find many expert users that are willing to give you further assistance.
You can also check for some decent video tutorials that will definitely be very helpful for you to set up a MS Exchange email account on your iPad or iPhone. These tutorials are a great place to start if you have difficulty setting up different apps on your phone.