How Configure webmail in Yahoo
Login to your Yahoo
Click on Setting.
See the Screenshot
Click On More Setting
see the right side on page on screenshot
Click on mailbox
Then click on Add
Enter Email Address
Click On Next
Verification Email will be sent to your Webmail Email address.
Check your webmail inbox and click on Email which Yahoo sent
In side Email which already sent from Yahoo
Click on text ( Click Here )
See the Screenshot.