How do I change the CSS styling for my startit theme?

Here is a sample from my site: http://wewatchyourwebsite.com/why-hackers-want-your-wordpress-website/

I want the quoted sections to stand out more.

I’d also like the text darker.

On my home page I’d like the text in the header slightly smaller.

Please help

It would be better if you ask the author directly via Support tab of the item.