Code
[twitter-widget title="Recent Tweets" username="mothemes" showintents="false" items="1" before_widget="<div class='widget_twitter'>" after_widget="</div>"]
[twitter-widget title=" " username="mothemes" avatar="normal" items="1" before_widget="<div class='widget_twitter'>" after_widget="</div>"]
More info: http://wordpress.org/plugins/twitter-widget-pro/faq/