Registration-Widget Not Working

I just installed the registration-widget plugin in my wordpress/buddypress blog. I activated the plugin. But, it’s not working. In fact, there’s nothing showing up in my sidebar that relates to registering at all. The login form is there, but as of now, I’m the only person who can post. Can anyone tell me how to troubleshoot this issue, or steps to take to get this working? Any help would be greatly appreciated.