The wordpress plugin All in One Webmaster lets you verify your website in the respective webmaster tools of the big three search engines Google, Yahoo, and Bing (MSN).
You may follow the instructions at the following page on how to install the All In One Webmaster plugin:
How do I verify my wordpress site on Google Webmaster Tools?
After installing and activating the All in One Webmaster plugin, follow the below steps on how you can verify your site on Bing using the All in One Webmaster plugin.
To verify your site in Bing Webmaster Tools using the All in One Webmaster plugin:
<meta name="msvalidate.01" content="64247826E164A0B76516C60EC54D13F0" />
Go back to your Bing Webmaster Tools account and click on the Verify button.
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