Hey, I have a theme and I am quite not familiar with it, I understand the syntax of the code but I would like to have someone help me with this matter.
You're going to need to be more exact. CSS or templates? The CSS is just normal CSS. You can use inspect element to see what class you need to edit, and to experiment. I find Google Chromes inspect element quite easy and friendly to use.
To add on to Rymax99's post, if you are a Firefox user then the firebug plugin would be just perfect.