As we can see above, we've selected the correct Surface and the correct Symbol but, if we look at our 3D object to the left of the dialogue box, the symbol is upside-down to the way we want it.
Don't worry! This can sometimes happen with Map Art. Hover your cursor above one of the corners of the preview in the window of the Map Art box (shown circled in orange, above) until your cursor changes to a curve with an arrow on both ends. Drag either clockwise or anti-clockwise until the art is the opposite way up.
Repeat this - i.e. scroll through the surfaces until the correct one is showing a red frame on the correct 'face' of the grey 3D object - and select the correct symbol, rotatiting it if necessary.