Changing M2D default buttons
 

I am sorry if this is somewhere already (I am sure it is) but I have been searching for awhile and cannot find it. I am trying to change the settings of M2D so that when I open my SMS it opens in another program. And same for phonebook. I know I can change the softkeys on the Home screen with the customizer but what about on the other tabs? Can this be done? Thanks!