Question: how to do tuplets in finale?
Answer: Click the Simple Entry tool. . ... 
In the Simple Entry Palette, click the icon representing the desired note's duration. Click any accidental tools, if desired.
Click the Simple Tuplet tool. ... 
Click the staff. ... 
After entering a note or rest with the caret, press 9 (or numpad 9) to begin a triplet on the note just entered.