I'm hoping this is a simple fix and I'm only confused because I'm new to WordPress. Please help!

I installed a theme called Wedding Photographer Nook because I liked the layout, however I'm having trouble with the way it's set up for the home page and posts page.

I want new posts to go to a seperate page which operates like a blog, but doing this by going to the page I want to set it as the posts page instead removes all the formatting and reformats it to the theme's homepage, which does not display latest posts. In Settings > Reading I try switching the settings around and it doesn't do anything at all.

Basically I just want to remove whatever it is that causes the posts page to reformat into this homepage template the theme has set up so that I can set posts to go to the page I designate.