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I didn't get much out of the video. If the radiator has a drain valve it will be on the bottom of one of the tanks. Not all radiators have a valve. You have to remove the lower radiator hose if no valve exists.
IF there is plug there it will probably be flush with the bottom of the tank and have a large cross cut into it, It may be above the tin splash plate that covers under the radiator to sump. Otherwise undo the hose clamp at the bottom of the radiator and gently remove the hose. It will be messy so do it in an area you can clean up after.
The drain plug should be ner the bottom of the radiator, either on the side or directly on the bottom. It should be a plug about 1/2 inch diameter and usually can be taken off with a screwdriver, but you may need a socket.
Unless you are prepared to clean up a mess you might want to get a small funnel with a tube so you can direct where it goes when it drains.
It's located on the drivers side of the radiator opposite of the lower radiator hose. Note: you may be better off disconnecting the lower radiator hose, it's common for the drain plug to break or the O-rings to split causing more work to drain the radiator. That's why most tech's will drain the radiator from the lower radiator hose, less chance of breaking the radiator drain plug and most new cars now don't come with a drain plug to the radiator.
I generally have stopped even looking for the drain...half of them don't work right even when you do find them. Far easier and faster is to remove the lower hose. If you have a closed system with no cap on the radiator then fill through the reservoir, otherwise fill through the radiator and add to bottle after you are finished. Run the heat on high while filling and wait for thermostat to open and level to drop before final fill.