How to fully install Adds on?

Hey guys, I have some questions... I see it says on many applications

"Upload contents of upload folder to forum root" What do it mean by that?What FOLDER(name) does I have to upload to on my FTP account?

Please help me, thanks

and if possible, link me on how to step-by-step install add ons
The forum root is the same folder that you uploaded your XenForo files to before you installed XenForo. Your forum root will contain the following folders:

Top Bottom