Thanks for the hints.

This is all kind of a mystery to me. GalliumOS seems to be built on xubuntu. I found a thread where somebody asks about drawers:
http://ubuntuforums.org/showthread.php?t=1365867
seemingly a drawer is not really a thing on this desktop.

xfce

I installed opera. I can't find a way to start it. There's no icon. I don't know the terminal command to start opera.
opera-stable is there in the downloads folder and when I open the file with the Package Installer, it says opera is already installed. I have the options of reinstalling or uninstalling. So opera-stable is on my computer, installed and ready to run. So how do I start it? Like I said, there's no icon.
I am running galliumos, a linux distro, on a chromebook c720p.

Edit: okay, I can start the browser by typing the command "opera" in terminal.
If I was running ubuntu, I would right-click the icon and fix it. That doesn't work in galliumos.
Any suggestions for getting an icon in the launch bar?