Well, see, we have to whisper because if I say yes, somebody much more knowledgeable and wise will barge in here (maybe the piano mafia) and give us something else to consider that would totally negate my advice.
I wouldn't say I'm more knowledgeable, but I will throw another fish on the pot.
Today is the first lesson, right? So why is the program already having you jump around so much? If they're just trying to get you used to recognizing notes as being the same in every octave, then that would be acceptable.
In that case, it makes no difference what finger you use, because you're only supposed to play the notes in a different octave.
Consider also that you're spanning past an octave to hit the F's and back down an octave to play the C's. There's no other notes up near the F's before you come down, so any finger would be useful. The 5, like m1469 suggested, makes sense because there is less physical space to span to get up there and come back down.
If you want to simplify things you can play the 4 on the F like you would if you're in your "home" C position.
All this to say that at the beginning level you're at, if your software doesn't tell you exactly what to do, either it's bad software or it doesn't matter one way or another what finger you should use.
Best,
Josh
PS this thread should probably be moved to the "student" section.
Topic: Help!