Can you still access the e-mail via the web at https://mail.yahoo.com ? Yahoo will ask for your e-mail address followed by your password. It should still work.
Outside of that, try using the following settings: https://help.yahoo.com/kb/imap-server-settings-yahoo-mail-sln4075.html
The above is for an IMAP account, which is the recommended way of syncing e-mail if you are using e-mail from more than one mail client, like a cell phone or a tablet in addition to your computer. If you need POP3 support out of preference, then use this: https://help.yahoo.com/kb/pop-access-settings-instructions-yahoo-mail-sln4724.html