PHP coding, need help please

Ok, so I found this: https://www.ads-software.com/support/topic/display-rss-feeds-on-pages-any-recommendation?replies=17 from a while ago, and it gives me an almost perfect example of what I want to do. Except I have no experience with PHP and so have no idea what to do to make the modifications I’d like to do. So I’m hoping someone can help me (at least point me in a direction, I can do HTML, CSS, some Javascrip, some C++, so I’m not totally clueless about programming, just about PHP).

What I’d like to do: modify the feed to display the title of the site along with the posts, and if possible modify the font size as its showing up HUGE when I try it.

Any ideas suggestions what not?