i need to change my email how can i do this

If you mean you wish to change the email address associated with your Apple ID:

Change your Apple ID - Apple Support

TraciaRichmond Said:

"i need to change my email how can i do this"

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Looking to Change your iCloud eMail Address?

You can't. Changing your iCloud eMail is not an option. Once it is created, it cannot be changed.

So, Use an Alias: Add and Manage eMail Aliases for iCloud Mail on iCloud.com - Apple Support