Noob needs help using “the loop” to intergrate into site

I am a noob at all this and don’t understand anything.

What I am trying to accomplish is to have the newest post be visible on this page: https://www.genadd.com/s-blog.php

In the center only.

Then i would need it to have a link so guests (who never have to sign up) can leave comments. There would also need to be a link to look at all the previous posts. I would prefer to have the comments and previous quotes be pop-up windows (in which case the ‘look’ of said pages does not need to reflect my site.)

I am just about at wit’s end, and have been seriously considering paying someone a small fee to get this task accomplished with ease…so any help is appreciative.