HI,
I understand exactly what you are asking for and this is not because I am good with what I am doing, but because I am not :))
Confusing, right?
So first of all you can not move a post to a page... helpful, right?
Solution as example: Lets say you want a ''page'' where all your reviews to be shown.
For that: create a new category ''posts - category'' and name it ''My Reviews'', for example. Go to the review you wanted to be shown on reviews ''page'' and quick edit. Choose categories and there choose your new created category ''My Reviews'' - update
Last step, go to appearance - menus - categories and select My Reviews category to be shown in your top navigation.
Update and enjoy ;) For any new review you create just choose the category ''My Reviews'' and it will be shown as wanted

Not clear what you ask. Angela assumes you want to convert it to page, if so use pTypeConverter plugin (not the only one).

But if you want to put it under a page in the menu, this is not a good idea. Make a separate container "page" without url. In any case. Appearance, Menus. Posts, Add to menu, Save menu.

you can do it manually but I believe there is a plugin which will do it for you. just google convert post to page wp plugin