In case you need to setup your email account manually.
Please note that below mentioned are the advanced set of instructions which you will have to follow,
Incoming Server – imap.mail.yahoo.com
Outgoing Server – smtp.mail.yahoo.com
Incoming Port – 993 (requires SSL)
Outgoing Port – 465 (requires SSL)
Username: full email address (your username @ yahoo domain .com)
Password: is the password you login to Yahoo! with the correct mail address.