How to Disconnect my Facebook Account from my Yahoo Account?

[doc-sil]

It appears that I have done some mistake somewhere resulting in connecting these two Accounts. Please Help me in disconnecting them. I replied to the email received by me but it appears to be a "no reply" one. Please help.
Dear Colleague,
Kindly disconnect my Yahoo Account from Facebook. I might have done it inadvertently.
Inconvenience caused is regretted.
Please email me your decision.

Wish you all the best.
Dr. J. Sil
From: "account-services-us@cc.yahoo-inc.com" <account-services-us@cc.yahoo-inc.com>
To: drjsil@yahoo.co.uk
Sent: Tuesday, 23 August 2011, 17:28
Subject: You've successfully connected your Facebook account to Yahoo!


Hey Jnanabrata,
You've successfully connected your Facebook account to Yahoo!
Now you can sign into Yahoo! using your Facebook account drjsil@yahoo.co.uk or Yahoo! account drjsil.
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