Post page problems

Thanks to all of you smarties, I’ve figured out the main issues with my main page and fixed accordingly.

I still, for the life of me, cannot figure out how to format my individual post pages. For example, if you go to my main page and then to an individual post page, you will see the formatting is very different. I want the formatting from my main page to also be the formatting on my post pages, but I can’t find the file to change that in.

I don’t have a single.php file.

what am I missing?