If you just deleted it out of the dock (by dragging it off) then open Finder, click and drag Downloads back onto the dock. If the Downloads folder isn't in your Finder sidebar then click on your username in Finder and it should be in there.
First, thanks for the explanation because being a PC user for most of my adult life my MacPro touch pad doesn't do a right click. Is there something I can do to make it right click?
Also, I did the control + click and it gives an option to have it either in folder or stack option, but either way I do it, it stays in the folder mode. What am I doing wrong?
Ok, I've never owned a laptop, so can't help you with trackpad functionality. Also, I'm not at my Mac. But, once you get control+click to work on the Stack, you should see a menu with two or three categories, and options under each one. Play around with them. You should notice changes. The "Display As" options will display the Stack as a Folder or a Stack. Kind of overlapping terminology there, but the difference is in the appearance of the icon in the Dock.
Just curious. Before you clicked "Fan", what was checked in that list?
I think the heading "Display As" should be "Display Icon As". That would head off some confusion. After all, the one below is "View Content As", and the one above is "Sort By", which is clearly another Content setting. So, from top to bottom it goes Content, Icon, Content; but the first two aren't labeled as such.