profile (little speaker looking icon)>advanced>select your profile you wish to edit (loud, normal etc) then find phone in the list and pick whatever ringtone you want... Same goes for every other type of alert. SMS, MMS, Mail.......
Find the Profiles icon on your screen. Click on it and scroll to Advanced... Then highlight your Active profile and press the Menu button and select Edit.
Scroll to your email address and click and then change the settings. Repeat for other email addresses, SMS, MMS, and any other settings you wish. Then press the Back button and SAVE your changes.