Go to your stats page while logged-in, by clicking following link:
If you have only one station in your account, go to step 3. If you have more than one ststion, select the station number you want to restore.
Copy the Unique Identifier (see screenshot below)
Give following command
(Replace xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx by the Unique Identifier you have copied from your stats page)
sudo piaware-config feeder-id xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx sudo systemctl restart piaware