Post Thumbnail within Single Post?

Hey guys

I am using a theme called "Paragrams" for a project and its specifically a photo theme similar to pinterest

What gets me, is that the photo thumbnails do not show up on the actual post (single post) but only on the homepage

So if someone adds a photo it shows beautifully on the homepage but when clicked on the post is completely empty. very annoying. Since I know this theme supports post thumbnails, how do I go about making them appear within the single post?

Thanks for any help you can provide!