Hi OldGeezer,
I'm assuming you have calibrated the iSpindel with 1.0 SG at 20-30 degrees in the calibration screen. And of course the rest of the gravity points. If so great you've done the hard time consuming part!
This is for version 6.2.0. However I think any 6.x version is very similar.
Now in BF go to your profile - integrations page and get YOUR iSpindel API key.
With this information go into the calibrations screen of the iSpindel screen again and set these four settings.
Update Interval = 900
Service Type = HTTP
Server Address = log.brewersfriend.com
Path/URI = /iSpindel/Your API key from integration page
Save the page and let the iSpindel reboot. Wait a minute and turn off/turn on iSpindel and look at the devices page in BF. You should see your unit there.
If you're stuck on a different part , let me know. I have put a three together recently so the details are still fresh in the old memory bank.
this page helped me some -->
https://www.opensourcedistilling.com/ispindel/