[Plugin: Rotating Tweets widget and shortcode] How to use the Shortcode

Hi, Martin.

I typed into a post like below, but I can not see the follow button.
Please let me know how to use the shortcode to show the follow button.

[rotatingtweets screen_name=’my ID’]
[rotatingtweets show_follow = ‘1’]

Thanks

http://wordpress.org/extend/plugins/rotatingtweets/