You can change your personal greeting from within the HulloMail app.
1. Select Menu -> Greetings
Here will be your list of greetings, the first 2 are system provided greetings, and any remaining are your recorded greetings.
2. You can create a new recorded greeting by pressing the top right '+' button, or you can edit an existing greeting by swiping left on a greeting which will reveal more options. Don't worry if you get stage fright, you can re-record and play the message as often as you like.
3. Once you are happy, press Save.
Your active greeting is indicated by an orange tick.
Please Note: If you are experiencing problems playing back or saving greetings, please check your iPhone Settings -> Privacy -> Microphone, ensure HulloMail is enabled.
4. Select Menu -> Greetings
5. Press 'Active greeting' and choose Personal Greeting.
6. Press record, and give it your best shot!
Once you are happy, press Save.