Firstly, undo the singular retaining screw on the air intake - use a phillips screwdriver
Undo the 5 x 5mm allen key retaining bolts
Remove the oil filler cup
Carefully lift the air filter box - replace oil filler cap
View of the air filter cover
Clean off any debris on the surface of the filter. Replace with new filter if heavily contaminated
Check air filter box for debris. Clean if required. Replace the air filter
Reassemble the air filter housing. Job done!