Cannot Access BT Yahoo from Mac Mail Account

Hi;

Up until recently I was happily using the Mail on my Macbook Pro OSC 10.9.1 BT Yahoo emails. I recently had a problem with my BT Internet account and had to change the password. Ever since changing the password I can no longer receive BT Yahoo emails.

Obviously it stopped because of the password change however whenever I enter the password in System Preferences I just keep getting the message "Unable to verify account name or password"

Can someone help?

 

As a follow up I found this Mac help page: http://www.apple.com/support/macosx/mailassistant/

Followed all the setting and changed my port from 110 to 993 and selected the SSL setting.

I then sent a test email to my self from Mac Mail. The message sent OK and I could view it when I lodged into my BY Yahoo account via Safari but I cannot receive the message using the Mail app???