How do you add payload and configure CG for the CF model? I've tried to load via entering a ZFW in the setup section of the FMC, like we do with the pax version, but it doesn't take any input. Apparently, there is no Load Manager for the 767II?  I can see no instructions for this is the manual, either. The Max, Random and Empty buttons don't work either.  The pax version still works fine.