Editing templates. Which files to use?

In my quest to find a calendar that plays nice with my theme, I installed this plug in today. All I need is a little help with what files I need to edit.

Here is my calendar page:
http://www.kucerainternational.com/calendar_test_sugarevents/

I have it set to use the default template under “Page Attributes.” What file should I edit? And the drop down boxes are too wide so I want to mess around with those. I believe

On Nov. 20 I have a “test” event. When you select it, the page looks like this:

http://www.kucerainternational.com/events/test/

As you can see, there’s no title, the times are not on the same line, and there are several other issues I need to fix. Can you please tell me what file I should edit?

While I’m not a programming wiz, I do know SOME about PHP and I am familiar with CSS. This plug doesn’t have a whole lot of documentation so I just need to be put in the right direction. Thanks much.

http://wordpress.org/plugins/sugar-calendar-lite/