[LAU] audacity urgent

[Joep L. Blom]

I have a big problem at the moment with audacity. I want simply to mix 2 
monotracks - recorded with the Zoom R16 - into one sterop track as I 
have to burn it to a CD (which has to be delivered tomorrow).
I can do all sort of rasks to it however, the menu Projects is missing 
and - according to the manual  - there you can combine tracks.
I'm running Ubuntu Karmic with audacity 1.3.9-6.
Can anybody help me out?
Thanks in advance