Welcome to the forum.
On my FL chassis, I can scroll through the menu using the joystick/rocker switch and pressing it up or down. To reset an item, the joystick has to be pressed to the right or left... I don't remember which way. Then the message center display tells me if I want to reset it I have to press and hold the joystick for 3 seconds. Not all items can be reset but certainly things like the trip odometer can.
Best of luck
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD