Styling Forms

I'm really new to CSS, but found your examples in the documentation helpful. However, I can't determine where to actually make the changes. In this page: http://www.gravityhelp.com/documentation/page/CSS_Targeting_Samples it says to "simply view your source," but I'm not sure where to find that. Does this mean to view the source of my theme's style.css and edit it under the section labeled "Forms"?

I'd specifically like to accomplish two things. 1. I'd like to decrease the spacing between lines (make the form a little smaller) and 2. Edit the form wrapper. Again, I think I've found the documentation to know the correct code, but I'm just not sure where to edit this.

Alright Rob. I may have overestimated my abilities to track where everything is pulling from in my theme. Can you take a look at this link to my landing page and tell me how I would edit both the form size and also create a colored form wrapper?

Thanks!

Here's the link: http://www.expiredsupport.com

Thanks Rob. I read some of the tutorials on how to change the wrapper earlier, but I'm just not sure where I actually add the code snippet you have above. Are you able to tell that from looking at my source code?

In terms of the form size, I feel like it is a little too long on the page compared to the video. What do you think? I was thinking if I was able to create less space between each field, it might look better.

Oh, and I'm glad you mentioned the piece about the Email and Phone fields background color. Do you know how to fix that? I obviously would like it to look like the other fields.

Thanks so much for your help!!!!

Thanks Rob. Just sent you an email...