Undo the circular clip on the air intake - use a screwdriver
Undo the three, 10mm retaining bolts
Now carefully remove the air filter housing
Undo the six retaining bolts - use a 7mm socket for this
Carefully open the air filter box
Clean off any debris on the surface of the filter. Replace with a new filter if heavily contaminated
Check air filter box for debris. Clean out if required. Replace the air filter
Reassemble the air filter housing. Job done!