Look up above you feet when they are on the pedals , a bit towards the door as well , if you put the seat all the way back and then lie on your back with your head on the floor and look up and to your left a bit[ that's towards the door ] you will see a square box , you will need a 1/4 drive rachet with a 10 mm socket on it and a medium extension , there's also a cable bunch in the way better to take the plug out first .
It's a bit treicky but NOT rocket surgery !!