Answer to: How do I change my fuel filterYour car does not have an (external) fuel filter like older Civics. It does have an in-tank filter that is connected to the fuel pump, which is in the fuel tank.
Answer to: How do I install an aftermarket double din navi?You will have to buy a double din kit. It is pretty big. It will run you about $30-40. You can probably get a Scosche HA1561BMB. You will have to double check on the color.
Answer to: How can I determine which engine model I haveIt looks like you are missing one digit in your VIN. I am guessing your car is FA1 which has the engine model R18. So, it should be 1.8L automatic.