Changing Colors – a few missing elements

Hi all,

I’ve got a wordpress site set up using the Highend theme from Mojo, all up to date. I’m having trouble changing the color of a few elements.

Specifically:
– Post headlines in the sidebar, they are black and I can’t find a way to change them
– Author info box below posts, the background is white and I can’t find the way to change it
– Same story for the related posts, their background is white.

Here is an example post, where you can see these three elements:
http://chrisgrundemann.com/index.php/2015/ietf-92-shaping-the-future-of-the-new-ip/

Can someone tell me what CSS to use to affect these areas/items it would be greatly appriciated!

Thanks!
~Chris