There are a couple ways you can do this in KDE (i myself am a Gnome person, so feel correct me if I get something wrong)..
1) using the terminal (command-line): Open up your terminal of choice (konsole is the default), and type
This will list all your running processes. If you don't want to have to rummage through a sometimes large list, try typing
ps -A | grep -i NAMEHERE
just replace "NAMEHERE" with a part of the name of your program (I think you said it was Snapshot)..
Take note of the process ID (abbreviated PID).. then, go back to your terminal and type
replacing "PIDHERE" with the actual pid number of that process. If it says something about not letting you kill that process, use
2)a user-friendly GUI : This method is like opening the Task Manager in Windows (the famous CTRL+Alt+Del), except that it actually WORKS. Open up your system monitor , which is named something like KDE System Guard (many linux distributions use CONTROL + ESC as a shortcut on the keyboard), and click on the Processes tab. Then just hilight the one you want dead, then click KILL. easy. (again, if it gives you any trouble about permission, run it as root or open it in termnal using sudo)
3)slightly-less-user-friendly: There is a program on your system called xKill. The shortcut for it is CONTROL-ALT-ESC. Simply click whatever you wanted to kill.
xkill will kill the FIRST thing you click, [b][u][i]WHATEVER [i][u][b]it is. click your desktop, a panel, Firefox, Whatever. Click it, and it ends. be VERY careful.
If you opened xKill and decide against using it, just hit ESC.
Hope this helps. ~~~~Alec