The sump plug located on the base of the engine. It is accessed underneath the car
You will need to remove the sump cover
Undo the fixings with a 10mm socket. CAUTION: the sump cover is heavy and must be fully supported during removal
Using a 19mm spanner or socket, carefully remove the sump plug and fully drain the oil.
When the sump has emptied, wipe clean the sump plug area with a paper towel and refit the sump plug and washer. Replace the sump cover