Navigate to the 'Swap' Page from the left side bar. Make sure you have a balance of SOL as all swaps and interactions with the blockchain require a small fee to be paid in SOL
From here you will see the 'Swap' and 'Liquidity' tabs. To Swap you will be using the 'Swap' tab.
To choose what coins you would like to swap between, you can click on the currency to see the window to select the coins to swap to and from.
When you enter an amount to swap from you will get an exchange rate and estimated received amount. Please note these numbers are indicative and are not confirmed until after transaction has cleared.
When ready to swap click 'Swap' in green and your transaction will be executed. You should see a confirmation popup in a dialogue box on successful trade.