I am trying to customize my site, and previously I did so by going to Appearance – Editor, and I see a list of theme files and stylesheet files. For some reason, now when I click on any of the files, only the stylesheet file opens up – when I click on the other files, no new content happens. This means the only thing I can change is the stylesheet and not the Header or Footer files like I was able to do before. What is happening? Please help!!