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[iDOWN]

Do you have to have a .MIDI file as well? If so, I have no idea how to convert from a .MUS file. Can someone please point in the right direction?

[HugoMeister]

Making a midi of your arrangement is extremely easy. 

1. In Finale, open your arrangement
2. Hit "save as" under the "file menu"
3. Down in the box where it says "filename.mus", hit the arrow.
4. Find the .mid ending.
5. Hit "save"

Here's a screenshot of what to click:

[iDOWN]

Wow, that makes me feel incredibly stupid. Thanks. 8D

[HugoMeister]

Lol no problem. I didn't know how to do it until someone else asked the same thing a while ago.