It will automatically operate by the PTU !
This will be the case for example if you did accidently forget the flaps or you brought the handle to 1 and during after landing checklist you accidently see it as flap 0 but the technician is asking when you parked is there anything wrong with the flap/slat ?
You have to do what Swedish Steve told:
you are going to use both electric pumps (Of course yellow has nothing to do with the slats; but it will pressurize the green through PTU automatically by the system when it realizes there is a need for pressure).