Hi, the following points could be why you did not see the button:
3 months ago
• You didn’t register your car
• You missed the timing for the contest. It begins at 12pm SHARP daily
• Your app isn’t updated
However, if you have fulfilled these requirements, I suggest you try to uninstall and reinstall the app. If that still doesn’t work please screenshot your screen at 12pm sharp and send it through our chat in the app. Hope it helps!