Start by navigating to Yahoo.com in your preferred browser. If you do not automatically load in the U.S. home page, click on the flag-drop menu that is on the upper right of the page, as of 2014. Select United States.
The link to take you to a sign-in page for your mail is an icon that looks like a small mailing envelope, as of 2014. Click on it.
Log in to your Yahoo account. You must have a Yahoo account to have Yahoo email. If you have forgotten your password, click on I Can't Access My Account, and follow the steps provided to reset your password.
After sign-in, your personal email page comes up. You can now check or send email.