The sump plug is located on the base of the engine, You may need to remove the undertray to gain access
Undo the fixings - use a 12mm socket
Don't forget to place a suitably sized receiving tray beneath
With an oil catchment tray in position, 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 fit a new sump plug and washer. Do not over tighten. Replace the undertray