If you open the appDetailScreen.brs and look at the following lines of code:
screen.ClearButtons()
screen.AddButton(1, "resume playing")
screen.AddButton(2, "play from beginning")
screen.SetContent(show)
screen.Show()
All you have to do is cut the line "screen.AddButton(2, "play from beginning")" and paste it above the line "screen.AddButton(1, "resume playing")" and it will swap the order of the buttons.
Furthermore, if you want the button to simply say "Play" instead of "play from beginning" just edit the text.
I'm thinking of changing the "resume playing" button to "OMG! Don't Press This" just for kicks...
Seriously, though... if you just swap the order of the buttons as shown above, you'll be okay.
If you want a vision of the future, imagine a boot stamping on a human face - forever. - George Orwell