Your wallet
When you first sign in, Privy creates a wallet for you on Robinhood Chain. It belongs to you, not to Sprite.
Where it comes from
The wallet is a Privy embedded wallet linked to your sign-in. A short form of its address is in the top bar, and the full address (with a Copy button) is in Settings. Sprite can only send from it after you turn on the agent.
Export your key
In Settings, press Export under Wallet. Privy opens a secure window where you can copy the private key. That window runs on Privy's side; Sprite never sees your key.
Link another wallet
If you signed in with email, you can link a wallet you already use from Settings. Sprite still sends only from the wallet Privy created for you.
Add ETH
Copy your address from Settings and move ETH to it on Robinhood Chain. When a funding link is configured, Settings shows an Add ETH button.
Saving notes doesn't need any ETH. Only sending does.