The sump plug is located on the base of the engine
You will need to open the sump access cover
Do not forget to have a suitably sized receiving tray beneath
Use a 17mm 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
Fit a new sump plug and washer. Do not over tighten - close sump access cover