Since I'm new to Joomla, I didn't know that I have to install both the module extension and the plugin to make it work. So I only installed the module. Of course, it didn't work without the plugin installed.
The technical support was really great. He was very knowledgeable and friendly. He provided in-depth support up to the point of checking the coding for me.
I'm very pleased with the developer of this extension and I think he had done an awesome job at providing free services to beginners like me.
Keep up the good work and I hope to see more of your awesome extension soon.