Just synchronize, then measure! Simple!
If you've unpacked your brand new iBGStar, it's important that the time and date settings are in sync with your iPhone before you can do your first measurement. But don't sweat, that part is easy.
Either open the Logbook app or the Sanofi app and ..................the date and time are matched.
From that point on, you'll be able to synchronize your readings and do live measurements without any trouble whatsoever.
P.S. Remember to synchronize again (before you measure) if you travel to another time zone!