Hi there,
I'm so sorry you're struggling with this. Custom menus are a little tricky at first.
It looks like you're off to a really good start! I went in to your custom menu and added a "Category Tab" which is "My Reviews" (I made the title "All my reviews" in case you wanted to leave your individual reviews posted) - you only have one "live" post tagged My Reviews, but if you click on it, you can see that it would display any of your reviews that you've tagged with My Reviews (you can try it out better by categorizing more of your posts with My Reviews).
Does this help you at all?