Directory Structure Help

[Armyqt]

I need some assistance. I've having issues installing Mods. And the main reason I believe is because I'm not putting the files in the right folders. Can someone please break it down for me. The instructions will say upload the contents of the upload folder to your forums folder. So I take the contents of the admincp folder and transfer those to my forums/admincp folder. But if there is a single php file is also in that folder, I don't know where it goes. Also, if a folder that has things I need to upload does not have a matching folder in my directory I don't know what to do. I am beyond frustrated at this point. I've added several mods to my board, but it's hit or miss and taking up way too much time because I am not understanding this basic step. All help is appreciated. Thanks.