You cannot unlink an email address from your account. If you don't want to have a certain email address to be linked to your account, simply change the email and link your account to another one.
More information you can find here: How to change my password / email address?
dosent work can only change password
As mentioned in the answer, you can not unlink your email address but you can change it only. Are you having a problem in changing email address?
Customer support service by UserEcho