Hi there, so here's usually how it works. As of this moment I'm using chrome
1. Right click on the screen, then choose inspect element at the bottom (I suggest you right click on the element of the page you want to modify)
2. You will then see some code at the bottom, as you hover on it, it will be highlighted
I've pointed out the element I want to change which is "data-dashboard-real-content" which are the colors of almost every link element in the site like the link "like".
You can also see the line where you need to edit it. To make sure I see what will happen before I edit it, I just add "color: chocolate;" in the browser and I can see what willl happen next.
3. Just in case you want to know the path or folder of the file, just hover around it
Hope this tutorial makes sense