The sump plug is accessed underneath the car
You may need to remove the undertray
Undo the fixings - use a screwdriver for this
Don't forget to place a suitably sized receiving tray beneath
Using a 21mm 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 fit a new sump plug and washer. Do not over tighten Replace the undertray