I do not know how to accelerate the tempo (Like in the Song of Double Time from The Legend of Zelda: Majora's Mask)
Example: http://www.ninsheetm.us/sheets/TheLegendofZelda/TheLegendofZelda:MajorasMask/SongofDoubleTime.pdf
I have Finale 2009 for Windows/PC.
Tempo alterations such as accelerandos and ritardandos are done through the expression menu, that's the button that's an "mf". Double click on the sheet where you want to put the accelerando, that opens up the expressions menu, and look for the one that says "accel."
Thank you Shado :)
I should have known that already>_<