You will need to remove the undertray
Undo the fixings - use a Torx-25 socket
Carefully remove the undertray, here is the sump plug
Do nott forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use a 19mm 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
Replace (new) sump plug and washer. Do not over tighten. replace the undertray