There two options. You can use the standard SMTP and POP3 settings uising the SSL options listed on the page below and the mail server host "mail.websitelive.net".
Or the better option is to purchase the Exchange ActiveSync Add-on from the Client Area which will allow you to have 'Push' email with the IPhone/IPad so you are immedtaly lotified when you receive an email. The Exchange ActiveSync will also sync in real-time any calendar events and contact with the webmail service.
I use the ActiveSync service myself with my Android based phone and Tablet and find it really good as you get instant notifications of emails and updating calendar or contacts on my PC, Phone, Tablet, or Webmail instantly updates on all devices.