Don't forget to place 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 re-fit the sump plug and washer.
Replace (new) sump plug and washer. Do not over-tighten