Tweaking The Radio Userland News Aggregator Posting Template

Here's what the story looks like when it pops into my aggregator. I decide from this (and the source) whether to read it or not. I think if I choose to read from this, then I should share that with my readers.

When I hit that Post link, my posting page comes up with the information pre-populated. I want to change this to match my own tastes.

Here's what I'd like it to populate as...

I'm hoping there's a template somewhere to plug the source, title, link, and summary into, with my formatting.