When the place of installation of the toilet is determined, fix it with the marks with a pencil, drill holes and insert plastic plugs. Then the connecting part of the toilet is attached to the sewage system, namely the corrugation. Turning to the next stage of work, you need to attach the screws that you were given together with the toilet, to the screws screwed into the floor. This is necessary so that the toilet stood well and does not shift from the place.