Hello,
Today I finally replaced my failing RPi 2 with RPi 3. I had to do everything from scratch. Now, when I go to My ADS-B page I see both stations. How can I get rid of the one which is not being used?
Go to your Flightaware stats page, chose the receiver you want to delete, and click the link “disassocite this feeder site from your account”. See screenshot below.
https://farm9.staticflickr.com/8200/28991175002_5d29261e53.jpg
Perfect. Done 
Thank you
Unfortunately, I have the same issue, but that selection above does not appear on my stats page. How do I remove a feeder?
The remove-site option doesn’t appear until the feeder has been inactive for >30 hours, wait a bit.