Please make sure that you're visiting our official Step Ex app: app.step.exchange
Connect your wallet by clicking on the 'Connect wallet' button in the bottom left corner,
Choose an exchange pair you would like to swap, give access to your token balance if needed by clicking on the 'Approve X' button,
Confirm sending on your wallet.
Settings: Slippage tolerance.
Slippage determines what is the maximal amount from the estimated amount that can be tolerated in the swapping process. So, if you have set that the slippage tolerance is 1%, it means that the final amount will differ from the estimate by 1% maximum.