A330 and 320 differ in redundancies. As someone said A330 is not a big A320. In A320 Approach mode cannot be armed as it requires inputs from RA. An easier way to fly ILS is treat initially as an NPA. With AP on and TRK/FPA, arm LOC. After LOC capture configure to Flap 2. Then put the gear down AP off, FDs off, set RW track and then on fly raw data ILS.