Adding a product to a blog post.

Hi, all. I looked for an answer to my problem, but I couldn’t find one. So here I am, making my first post.

I produce comedy shorts with t-shirts attached to sell. I’m using Press75’s OnDemand theme, because it’s great for video. I tried WP’s e-commerce plug-in to add products, but it set up my products in it’s own new place on the website, without the ability to pair them with their video.

I want to simply add the ability to purchase the shirt to the post itself. How do I do it?

Thanks for your help!