Why can't I find links and change button colors in Shella theme?

[GallardoBlaine]

Hi there. Don’t know if anyone can help me but I’ve got two problems. There are two drop down boxes that appear when you slide over two things on the main menu that link to other pages but I cannot find these anywhere to change images & details. Where might they be stored ? I’ve looked in all the obvious places. Secondly, I want to change the colour of the ‘add to cart buttons’ but when I changed it in settings it made no difference. If anyone can maybe give me a pointer as to where to start it would be much appreciated. A tech guy set up the Shella theme for us so I suppose he might have coded them in ? Thanks anyway.