Its a long process as it hidden behind most of the engines components. I'll break it down for you step by step:

1. Ensure the engine is cool and the engine has been off for several hours
2. Unplug the battery
3. Open the engine bay cover
4. Remove the cylinder furthest from the front and the spark plugs from the rest
5. Empty the break fluid and disconnect the break lines
6. Once you have done this you'll see fuel injectors that where connected to the removed cylinders. Weld these shut (so nothing leaks as the next part is risky. Oh and don't worry you just cut the injectors open when your done to allow the cylinders to work again.
7. You'll then see a blue square in the base of the engine bay, saw that open and you'll see feull filter in there.
8. Once the you can see the filter just unscrew the four screws around its edge and replace it with a new one
9. Then just undo everything have done it should ll work well!