do you mean how to make another email w/ a different provider?
or an additional windows mail account?

microsoft windows mail might have a limit to how many emails you can create.
if your looking to create something totally else, go to gmail.com or mail.yahoo.com… which obviously u already have.. but if u log out u can create another.

if you want another microsoft email than email/chat me and lemme know.. ill try to help u out