Once the screws have been removed there is a small plastic clip that must be moved upwards to release the radio, use a small flat blade screwdriver to do this. There are two, one at each side this picture shows only the one on the left.
The radio can then be removed by inserting the plastic trim tool under the bottom edge of the heated seat panel, the radio slides up and towards you.
The radio uses the popular quad lock plug without an ignition positive, if ignition is required this can be found at the 12v power socket in the back of the glove box.