You can customize the Slippage and Gas Fees (Gwei) under the “Advanced Settings”. Simply go to the Swap tab and click the settings button to do so:

Slippage Tolerance allows the user to specify a percentage range, where the swap transaction will be canceled to prevent unexpected losses if the swap index price deviates above the specified amount. The customizable range for Slippage Tolerance is 1% to 49.9%.

Gwei is the denomination (sub-currency) of Ether (e.g. what cents is to dollars). Gas Fees, measured in Gwei, are payments made by users for the computing energy required to process and validate transactions on the Ethereum blockchain. In the advanced settings, there are 3 levels/speeds: Slow, Average, and Fast. The faster the transaction speed, the more Gas Fees, or gwei, you will need to pay.