The sump plug is located on the base of the engine. It is accessed underneath the car. You will need to open the sump access cover
Do not forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use a 17mm spanner 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. Refit the sump access cover
Try to keep the plug pressed into the sump while unscrewing it by hand the last couple of turns. As the plug releases, move it away sharply so that the stream of oil issuing form the sump runs into the container, not up your sleeve.