Go to Rate My Renault
-> My Garage -> (on right side of table you have "edit" + "delete") Click on Edit -> Change specs -> Delete/add newpics -> Done.
Remember: You will see all your cars in "My Garage", but you cant edit/delete your car unless you are on the domain which the car belongs to. So if you want to update your renault, then use Rate My Renault
. If you want to update your fiat go to Rate My Fiat
Let me know if you still have questions.