Placing Posts on Front Page by calling PHP

Hello, first off I’d like to say that I’m using RT THEME 15 on my website.

Secondly, I would like to have 1 blog post (the most recent) show up on my website’s front page. We have a static front page, so I don’t want to use all my blog posts as the ‘Home’ page.

I’ve tried everything from downloading PHP execute plugins to hardcoding it, and nothing is working.

Our website is Here.

As you can see we have the three main text blurbs, ‘About Us’ ‘Products’ and ‘Pandemic Plan’.

Then there is the Award’s box and under that the ‘Becoming Incident Ready’ slider.

I want to remove the Awards box and Incident Slider, and replace them with another three boxes as shown below the Featured Images Slider.

Within those boxes I would like a single blog post, preferably from different categories.

Any and all help is welcome. Thank you for your time.