No tap to touch for touchpad in lxqt running Ubuntugnome 16.10

I want to get lxde and xfce working so that tap to touch works for the touchpad. It is so painful to work.. that I am not using it. I need it to run Ardour more smoothly.

I have installed Synaptics TouchPad driver for X.Org server and the.d version from repo

I am not able to complete the instructions found in https://wiki.archlinux.org/index.php/Touchpad_Synaptics#Configuration because there is no such file to edit (assuming xsession is the next equivalant). I see nothing with "syn* in the search (using nautilus) in the etc/x11 directory ..

I hope someone can help me.