Ok, so once you have the plugin installed, go to the post or page that you want to change, click on edit, and I'll walk you through the rest on how to change it.

When you make the switch, it should look as follows:

Now that you have switched your post to a page, just click on OK, then click on Update.

That's literally all it takes, and all your comments and everything else transfers with it.

======> Nest Page Please