Something I see asked all the time here at Wealthy Affiliate is new members that want to know how to change pages to posts and posts to pages. This is such a common mistake to make and one that I made too when I first joined WA and built my first websites from scratch.
I have seen so many members suggest that you just copy your page content, create a new post and paste your content in... then go back and delete the page.
There is however a much quicker way to do it and that is using the plugin Post Type Switcher. At the touch of a button you can convert pages to posts or posts to pages.
I hope you have found this helpful :) It certainly saved me from copying over about 15 pages to being posts!
If you have any questions please leave a comment.