How to set up your display send email on an iphone.
1. From the home screen select Settings (the cog icon)
2. Select the Mail option
3. Tap the Accounts option
4. Tap the mail account you want to modify
5. Under POP Account information tap on the email address
6. Tap the Add another email option, type in the email address you want your recipient to see and tap to put a tick/check-mark by it to set as the default