How to Add a Banner Ad to the Extreme Left and Right of a Single Page

Hello-

I want to place affiliate Ads targeted for SPECIFIC Pages.

Like this Page – https://www.evolvewithflavor.com/raw-food-weight-loss/

I came across the function page_ad() here->

https://diythemes.com/thesis/wordpress-ad-placement-guide/

But I’m confused. I’m a programming Newbie, how do I target the LEFT and RIGHT hand sides of Specific Pages for Ads?

Thanks!!!

Rich