You may need to remove the sump cover / undertray
Undo the retaining bolts, carefully remove the undertray, Careful this is a heavy item!
Don't forget to have a suitably sized receiving tray in place
Use an 8mm SQUARE 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
Replace (new) sump plug and washer. Do not over tighten. Replace the undertray