Your email account provider should have the necessary server names and
settings on their website.
Keep in mind that Windows Mail cannot access any webmail accounts.
I see you posted with a Yahoo email address. Is that your only
email address? US-based free Yahoo accounts have webmail
access only, no POP access. Windows Mail handles POP mail but not
webmail. There are two Yahoo solutions:
1. How did you access Yahoo mail before? If you are happy with
webmail via your browser, you can continue to use that.
If you are OK with using a non-Yahoo email address, you have two other
solutions:
3. Use the email address assigned to you by your ISP.
4. Get a free Gmail account.