Moving Elements

To all,
I am not familiar with the entire construct of my wp hosted website. However, I have a relatively advanced e-commerce website that I need to move some elements around in. I have a massive file directory and am trying to track down the code that I need to alter to move these elements. I can use the developer tools in Firefox or Chrome and drag and drop these DIVs into the position I need them in. However, I cannot seem to make the change permanent. I cannot correlate the HTML code to the code in the file directory. I have made the changes in CSS. However, I need to find the file that I need to move the elements in. Please advise on a strategy to resolve this.
Thanks!