The first time you open it, Biscuit asks three questions about the network, before it makes any connection. Then it helps you create or restore your wallet. Everything can be changed later in the settings.
Biscuit needs a Monero node to find your transactions. A node is a computer that keeps a copy of the Monero blockchain.
host:port.If you run a node on this computer, Biscuit sees it on port 18081 and says so. See Nodes for what a node can and can’t learn about you.
On Tails and Whonix this question is skipped: Biscuit uses the system’s Tor. Read Tor mode for the details, including the Monero node traffic setting.
Biscuit can fetch prices, currency rates, the Journal and Monero’s crowdfunding proposals from biscuitwallet.com, to show your balances in your currency. Nothing about your wallet is sent. Choose Enable or Disable; the settings also offer Tor only. See Prices and other data.
Then comes the main menu:
Tick Open on startup when you open a wallet, and Biscuit opens it directly the next time.