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The user name cannot be changed as per this FAQ: http://service.mcafee.com/FAQDocument.aspx?lc=1033&id=TS100637
As I don't have the product myself I can only guess that to change the email one would need to completely uninstall and reinstall.
You might want to double check that with Technical Support first though. It's free to phone or use their online chat and linked under Useful Links at the top of this page.
For your area there are phone numbers and links here: http://service.mcafee.com/faq/country.html
(See Asia Pacific (APAC)