time signature or no time signature

[chip]

I am working on a song in which the first bit is all free time. I would 
like to enter the beginning of the song with no time signature - just an 
empty measure and the words Free Time below it. I've got the empty 
measure and the text done (though the text is longer than the measure), 
how do I get rid of the time signature? I will put it in the next 
measure, where the song really gets under way.
Thanks,
Chip