In this video from MarketingTwins we learn how to use TweetDeck in order to retweet something on Twitter. In tweetdeck it is very easy to retweet. You hover over someone's picture that tweeted something, and then click the retweet symbol. This will then appear in your text box. If the status bar turns red it means you exceeded the 140 characters, so you should go back in and delete some of the characters in there to fit the 140 in your status box. Once your message is set, just hit enter and you will retweet the message. That's how you use tweetdeck to retweet something.