to test the level, remove the sump plug metal bolt at the bottom - it should only trickle some oil.
to drain the oil you need to remove the plastic funnel inside the hole where the bolt was. Its screwed in an uses the same 6mm allen key you used to remove the sump plug.
To fill - you first pour in half a litre of oil from the TC port and let it drain out too. Then install the plastic funnel and add oil till you see a trickle, reinstall both plugs.
You can buy it from any shop in Plaza area. Its called Toyota CVT TC. Silver tin and its about 4,000/- rs.