Activate a Widget for SMS Text Message

Hello I want to activate SMS Text Message on my blog and I did so under the plugins section but I dont see where people would register for SMS updates.

It says I need to activate the widget but I dont know how to that.

Any help would be greatly appreciated.

The plugin can be found at http://ww.wp.xz.cn/extend/plugins/sms-text-message/

Thanks- ojhernandez