Strictly speaking, you can't do this. You can, however, create an alias for your SUNet ID, and use the alias as your public email and web address — that way, nobody will see your SUNet ID except you (you'll continue to use it as your login ID).
To do this from StanfordYou:
- Log into StanfordYou.
- Click Change settings for account to go to the Accounts page.
- Click the Email tab and then click Manage aliases.
- Enter an alias and click Save.
If you have a compelling reason to change your SUNet ID, you can submit a Help ticket explaining the situation. Requests for change are granted infrequently because changing a SUNet ID is a lengthy and complex process involving many people and systems.