How do you change fuel filter on a 2004 Mazda 6?

apparently it's in the tank, but if you jostle the tabs under the back seat and lift it up there is a panel. Open the panel, there is a fuel line and cord attached to some other thing. Those can be disconnected and set to the side, (that's another issue to google) from there

you need a special Mazda tool to unscrew the circle part or something. I don't know, they make it so you have to buy all these tools to do anything. I put something that I don't think was gas in my gastank. I'm trying to drain the fuel line from the engine area and might need to replace the filter myself.

I hate everything.