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Activate like any plugin. After that, visit Settings->TweetScribe and add your twitter username/password. When you press save, your blog will automaticaly be listed on the TweetScribe page and an API key will be provided.

Optionaly you can add the widget with your badge, or, you can copy the code and paste it wherever you want. You can check out the API for more integration options at http://tweetscribe.me/integrate/api