How do I swap (exchange) tokens on STON.fi?

To swap tokens on STON.fi, you first open the app and go to the Swap section. Choose the token you want to send and the token you want to receive from the dropdown menus. Enter the amount you want to exchange, making sure you have enough TON in your wallet to cover network fees. The interface will show you the expected amount, price impact, and route before confirming. After reviewing the details, click Swap and approve the transaction in your TON wallet. The swap usually completes within a few seconds, and the new tokens appear directly in your wallet. If something doesn’t show up immediately, refreshing the wallet or STON.fi interface usually resolves it.
 

See the link for more details.