Try going to the Log tab (instead of the Reports tab), select Custom, then New Measurement, then Custom Measurement, type in Blood Glucose Reading (or insulin) to create, then click Save. It lets you do this more than once (I only tried two), but hopefully it will let you do all that you need.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days