The sump plug is accessed underneath the car
Here is the sump access cover
Undo the fixings - use a 8 mm socket
Now you can open the sump access cover
Don't forget to place a suitably sized receiving tray beneath
Using a 17mm 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 a new sump plug and washer
Do not over tighten - close sump access cover