Uniswap is the largest decentralized exchange on the Ethereum (ETH) blockchain. Uniswap allows users anywhere in the world to exchange crypto without an intermediary such as a bank or a broker. 

Trade → Exchange 

Once you are in the exchange function and have connected your wallet to Uniswap you should see your ETH balance. You will also see a dropdown menu with many other tokens listed. There may be times where the token you are seeking will require you to add the token address to the list. Always make sure to get your contract address from a reputable source.  

Gas on the Ethereum Chain

In order to pay for gas on the Ethereum chain you must utilize Ethereum. In order to execute trades or stake your tokens you will need to have enough Ethereum for transaction fees. Please note that Ethereum gas fees can vary drastically and it is best practices to check fees before trying to execute a trade.