For easy-to-understand instructions to create a drop-down menu for your categories (labels), see this post. You will have to find pre-existing code in your vast template HTML, which is easily done by typing CTRL F (Windows). On the lower left of your screen you will see a little search window. Enter all or part of the code you are looking for. The first occurrence of that particular piece of code will be highlighted in green. If that is not the one you need, click on Next to see the next occurrence, and etc.
I'm sure that with a little bit of brain action you could use these instructions to make drop-down menus for other features. Happy creating!