I recently got a MacBook Air at work and since I've never used Mac OS before, I googled how to change the desktop background and the login screen from the preloaded awful looking company background pic. However, going into System Preferences and changing it from there didn't work. I even tried to take a random pic and change that to the desktop background by right clicking and clicking Share. There was no option for changing desktop background.
If the change desktop background option has been disabled by the IT admin, is there any way around it?