Customizing Blog Post Pages

As I delve into enhancing the user experience on my video editing website, Synergy Creations, I’m encountering a hurdle in customizing the layout of blog post pages to seamlessly align with the existing design. Seeking advice from fellow WordPress enthusiasts on integrating a top image box and optimizing layout cohesion. Any insights or plugin recommendations appreciated!

The page I need help with: [log in to see the link]