There has been enough said about learning things from scratch here. I also told you about a year ago that you should make some simple site as an excercise, in order to learn basic coding.
The problem is, that without this basic knowledge of html and css you will get completely lost when using a programme that creates a series of css files for you. You won't be able to find what you're looking for unless you know where to look. Clearly, that background colour you want to get rid of is in there, you will find it in one of the css files pertaining to RLM.
This being a school project, I think that Jo Ann is quite right in saying that you should rather learn coding than having a programme doing it all for you. I know nothing about the exam systems at the school you are attending, but if you get questions about how you made this or that, would you be able to answer such questions, other than saying you have a programme that created it for you? I doubt that answers like that will give you an A.
Oh, and BTW, I think you owe Steve an apology.