Editing Mousepad settings

[sourscreme]

I need to edit the synaptics settings, therefore i am searching the synaptics.fdi file (Been said in ubuntu forums).
Where can i find it ?

Or like other files that i am searching for fixing my issues, which should be here /etc/modprobe.d/psmouse.conf or /etc/modprobe.d/options

[sourscreme]

I wanted to edit the mousepad settings, which i found out i can easily do by type synclient in terminal.