Take a look at the FAQ’s page. Some problems are a common occurrence, and a solution to the issue you are having may have already been found.
Make sure you have throughly read the documentation included with your download of the plugin. It contains many guides on how to use specific features of the plugin correctly.
Try disabling as many other plugins as you can. Also try changing the theme. If one of these changes fixes the plugin, let us know. This will make troubleshooting quicker.