From memory take fuel cap of undo the pozzy screw and pull out the inner plastic with the flap still attached, pull it from thr latch end so it comes out at an angle.
Put the new rubber in hot water to make it easier to fit, and if like mine they are new old stock so have still been sitting on a shelf for years so are not as pliable as they should be and will still crack a couple of years down the line.
this is for the 2wd so if 4x4 there will be a cable to detach I’m presuming..