It's my first time to use a plugin. I want to create a photo gallery that has a hierarchical category. I found this plugin called Mac Photo Gellery that says will do the job. I installed it no problem, but after it is completed installed and activated, I do not know how to use it; I do not even know where it is. There is no windows popping up automatically to ask me for configuration. How can I use this plugin? Many thanks.