If you are sharing to other networks alongside Flightradar24 ie. Flightaware, Radarbox, AdsbExchange, etc, please disable MLAT on either your configuration file
ssh into your pi first: (How to SSH into a Pi)
ssh pi@ipaddress
Make sure you replace ipaddress above with the actual IP address of the Pi i.e. ssh pi@192.168.1.20
Once you are at the command line:
sudo nano /etc/fr24feed.ini
Change both mlat options to "no". Save (ctrl+o) and Exit (ctrl+x). Once done with the change below, restart the pi.
receiver="avr-tcp"
fr24key="sharingKey"
host="127.0.0.1:30002"
bs="no"
raw="no"
logmode="1"
logpath="/var/log/fr24feed"
mlat="no"
mlat-without-gps="no"
Or via the Web UI
Open your browser and go to your Pi's local web interface
http://ipaddress:8754
Make sure you replace ipaddress above with the actual IP address of the Pi i.e. 192.168.1.20:8754