Getting Dropbox back in my Finder Favorites after upgrading my Mac software

Robert, it really isn't necessary to be condescending. Brenda was asking a simple question as best as she knew how.  I can only imagine that because I had the same question.  I spent quite bit of time researching this and realized where the confusion is.  Dropbox has an application that the user can download to their computer.  This application creates the dropbox folder, and once created you can then drag the folder to the favorites as you demonstrated in your you tube video.  Also,the additional information on where the dropbox folder resides is very helpful.

For anyone else researching this, the app is downloaded from the Dropbox login page.  The location and the appearance seems to have changed, but the process is the same.