You can change your Craft account email address from your account settings.
Change Your Email
Mac
Web / Windows
iOS
Android
Click the Space name at the top of the sidebar to open Settings. Open the Space dropdown
Click the Space name in the top-left corner.
Select Settings
Click Settings at the bottom of the dropdown. Tap the Space icon
Tap the Space icon in the top-left corner. Open Settings
Tap Settings.
Tap your profile picture
Tap your profile picture in the top-right corner.
Click Change Email in the email field
Unable to Change Email
You can only change your account email to an email address that doesn’t currently have a Craft account.
If the Email Is Already in Use
If you need to use an email that’s associated with another Craft account:
Delete the account that uses the desired email address (go to Settings → My Account → Delete Account)
Once deleted, the email becomes available for use with your remaining account
Change the email in your active account (Settings → My Account → Change Email)
Deleting an account will permanently delete all documents in that account. Make sure to back up any important data before deletion.