You will need to remove the car's undertray
Undo the undertray fixings
Carefully remove undertray – it is quite heavy
Don't forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use an 8mm Allen key or socket to 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 (new) sump plug and washer. Do not over tighten