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This is an advanced feature and should be used with caution. Start9 is not responsible for any damage you might cause through SSH access.
Navigate to Developer Options > SSH Keys
+ button in the lower right hand corner.
Paste in your SSH key.
You can now access your Embassy from the command line using:
ssh pi@<LAN URL>
One of our community members, @brewsbitcoin, has put together this guide for connecting via PuTTY on Windows: https://medium.com/@brewsbitcoin/ssh-to-start9-embassy-from-windows-4a4e17891b5a