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There are 2 ways you can do.
#1 Give the new user the login access to your account/username leae
The new user can login to the account at https://www.jotform.com/login
#2 If the new user have their own email account, you can change your account leae email to that of the new user.
This way the user will be able to change the login password of the account and they can now login to it.
I recommend option #2 since you won't have to divulge to the new user your own password/code.
Hope this help. Let us know if you need further assistance.