I have not used this software, and as no one has answered I offer the following. Time signature, aka, 3/4, 4/4, 6/8, etc. tells us how many beats per measure this song will use.
Once decided the song will normally use that time signature through out the song.
I would think the software would ask what time signature is to be used and then use that information to sub-divide the beats into measures.
Hope that helps.