the hood is open.
Open the trunk with the ignition key. There is a small opening in the upper right hand side of the trunk lid.
Open the hood, slam it shut and the message will go away!
Apparently your rear trunk latch needs adjusted.
if i don't have the key to open the trunk or the push button does not work from the inside of the car to open the trunk of a 1999 mercury cougar, could i be able to bypass the button or switch to open it?
Key or remove the rear seats for access
Check all the electrical connections and try lubing them with electrical grease.
dealers can do it - they have a way to get in from the engine compartment but won't share how it is done :(
Try consulting the manual that came with the car
press the big button above with the keyhole on it.
the hood is open
Open the hood and you will fidn them. DO not think they are in the trunk :)