(1) Gain adjustments can NOT be made from FA “My ADSB” page.
(2) Gain adjustments can be made remotely provided:
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The computer/tablet/phone from which the commands are given is on the same Local network as the Pi.
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SSH has been enabled by creating a file SSH in /boot directory of microSD card. To do this, you have to shutdown Pi, take out microSD card from Pi, slip the microSD card in card reader/adapter, and plug into desktop/laptop. After creating the file SSH, take out microSD card from laptop/desktop, slip into Pi and power up. SSH will be enabled. Click Here for details. Scroll to item “5(a) To enable SSH”
Unfortunately, to enable remote access by SSH, you need to access Pi twice, first to remove microSD card, then after creating file SSH, again access the Pi to slip in the microSD card.