If you are playing using a Dualshock 3 then there is no way to use the touch pad controls. It is annoying that they didn’t come up with a shortcut to at least allow a click of the touch pad, but there isn’t.
If you have a Dualshock 4 controller then use this instead. This will allow you to use the controls. If you want to use any of the dualshock specific controls with the PlayStation tv then you will need to use a dualshock 4.