looking for engine drain plug (coolant) for '96 camry engine 5S-Fe

Please help...I am in the middle of flushing the engine coolant of our 96 camry with 5S-FE engine. I have flushed the coolant on the radiator but I could not find the engine drain plug to flush the coolant on the engine. The owner's manual is not very helpful.

Drain plug is in right rear of engine block