I want to know how to add an additional email to my account?

I tried the other user and it will not let me do it.
I want to know how to add an additional email to my account?
Just open an account like you did the first one but, make sure the othe account is not running.
Reply:if you know how to add additional email to your account, you can add my email too.. mkhoviyeun@hotmail.com