You need to have Nightscout-compatible server.
If you don't know what it is -- just install Gluroo app on your phone,
and go to Menu -> Devices -> OTHER tab to find your Nightscout URL and API secret.

Follow medical advise from medical specialists.
While you can see graph from the device here, it may be outdated, sometimes by an hour or more; the plugin graph is mere convenience, but NOT for decisions.
If you feel bad, contact 112 or 911 or whatever your emergency number is!