How do I connect my TON wallet to STON.fi?

Go to STON.fi and click Connect wallet. If you’re on desktop, choose your wallet from the list; if you’re on mobile, scan the QR code using your TON wallet’s built-in scanner. Approve the connection in your wallet app. Once approved, your wallet will stay connected until you disconnect it manually or clear your browser cache. If your wallet doesn’t appear, make sure you’re using a TON-compatible wallet and that it’s properly imported on your device.
 

See the link for more details.