The system file is:
/usr/share/X11/xorg.conf.d/50-synaptics.conf
cd to it and open the text file with the name 50-synaptics.conf and place the following text in it. Some text is already there: you most probably only need to add two lines. The text is the following:
Code: Select all
Section "InputClass"
Identifier "touchpad catchall"
Driver "synaptics"
MatchIsTouchpad "on"
Option "TapButton1" "1"
Option "RBCornerButton" "3"
EndSection
Enjoy!