Place a container for used oil under the engine crankcase
Unscrew the plug and drain the oil from the crankcase
It is better to drain the oil from a warm engine.
Tighten the drain plug.
Replace the oil filter or filter element.
Also see the article - “How to change the oil and oil filter”
Unscrew the filler cap and add fresh oil.
The oil level is controlled using the oil level indicator (dipstick).
You need to fill the oil up to the “P” mark on the dipstick.
Then close the plug, start the engine and let it run for a while, turn off the engine and wait a few minutes until the oil drains into the crankcase.
Check the level on the dipstick and add oil if necessary.