To exchange your coins, go to exchange tab in the web wallet and follow these steps: 

1. Choose the coin or token you want to exchange from.
2. Then choose the coin or token you want to exchange to.
3. Enter the necessary amount, set the fee, check all of the details and tap “Confirm”.

Then wait until the outgoing transaction has 3 or more confirmations. After these confirmations you will get your exchanged funds.