You may need to remove the sump cover
Undo the retaining bolts - use a 10mm socket or spanner
Don't forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use an 8mm allen key 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. Do not over tighten