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Hi Peter
On the front right hand side of the engine by the side of the centrifugal oil filter domed cover there is a large plug (22mm spanner size)
You should also clean the centrifugal filter by removing the cover & then lift off the rotor,undo the nut on the top & part the two halves clean the insides throughly, when you assemble the rotor align the scribe marks that are on the bottom of the two halves to maintain balance of the rotor.
The plug is by the oil filter cover! Not the oil pressure switch.
If you cannot find the plug you can fill the oil through the oil filter base easily with the rotor removed.