FMC with OnAir manager

I’m trying to find the best way set up the fmc whilst using a route with OnAir
OnAir loads the fuel you tell it and loads passengers or cargo that’s preset from the job selected.
How do I put that information from OnAir into my fmc. Is it me or is it that easy to understand and do. To be honest I just purchased the new CRJ and as that requires weight and balance entries just wondered how I do that
Many thanks