Comment 11 for bug 947354

Check out the folowing if man synclient doesn't offer you much:

man synaptics
     or
https://wiki.archlinux.org/index.php/Touchpad_Synaptics

Personally I dont understand why the config and folder structure you created did not work. It should have been like this:

/etc/X11/xorg.conf.d/

with a file named 51.clickpad.conf with the following:

Section "InputClass"
Identifier "Default clickpad buttons"
MatchDriver "synaptics"
Option "SoftButtonAreas" "50% 0 82% 0 0 0 0 0"

EndSection

Is this how you have done it?

All you have to do is log out and log back and the right click should work.