The sump plug is located on the base of the engine, it is accessed underneath the car. You will need to open the sump access cover
Do not forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use a 17mm spanner or socket to carefully remove the sump plug. 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. Do not over tighten. Replace the undertray.