Hi Rocky,
Do you mean you want to change your email account's display name?
If yes, you can do the following steps:
1. Login to your Office 365 as an administrator.
2. Click Outlook in the top link bar.
3. Change the URL from podxxxx.outlook.com/owa to podxxxx.outlook.com/ecp.
4. Click recipients and then click mailboxes.
5. Double click the mailbox you want to edit.
6. Click general and then edit the Display name.
Thanks,
Jerry Cen