I'm still not quite sure where you are, but I'll assume that you have one user set to boot automatically into KDE. If you're somewhere else you will ultimately need to get to a terminal window as root. If you're where I think you are, try this:
On the keyboard, hit the right Windows key. A menu will pop up. Use the up/down arrow keys to get to 'Terminals'. Use the right arrow key to the sub-menu. Use the up/down arrow keys to navigate to 'Konsole - Super User Mode'. Hit the Enter key. If the tip of the day pops up, hit Enter to close it. Type the root password and Enter. Type mousedrake. Use the arrow keys to select your mouse and hit enter.