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

In the example that Robert S. shows on his You Tube video works IF you have a folder on your Mac labeled Dropbox.  His example does NOT work if the DB folder resides on the Dropbox site.  Instead, a gif file is saved that creates a spacer.

... was asking a simple question...

Correct. And, it was clear from reading the question it concerned the installation and use of the Dropbox software - the recommended way of using Dropbox, in fact.

Condescending, no. Endeavouring to provide a clear, appropriate and helpful response to a question posed by actually reading it, yes.

Hey that answer doesn't seem to be helpful to me because the darn thing installed into Itunes. How the do I get it back into  my favourites section.

Hey Robert...would you like to see my movie of it NOT working??

Sure.

I found the explanation here very helpful and resolved my issue in seconds. Thanks so much.

The solution worked for me. I upgraded to El Capitan a few days ago. I just fixed it using Robert's solution. First, the problem may be you are not noticing that the Dropbox icon is now at the top of the finder window to the left of the search bar after the upgrade. I personally didn't want it there. So I did a search for "Dropbox", my Dropbox folder came up and I dragged it onto the sidebar. To be sure, I closed Finder and it was still there.

I've read the thread carefully, viewed Robert S.'s youtube video but still need help:  I have two dropbox accounts.  One shows up in the left hand finder window.  The other used to but doesn't any longer.  How do I download that account so it shows up on my computer and can therefore be dragged over to the left hand finder menu?  Right now it doesn't show up on my computer, although if I open a file through say MS Word, and do SAVE AS, I can see the account and save docs to it.  Thanks in advance.