To adjust your slippage tolerance, start by clicking the settings button positioned along the right hand corner of the swap window (resembles a gear icon), it will bring up a menu labeled Settings.
You can type in a custom slippage tolerance and input the percentage you feel comfortable with in the box at the bottom. If you have to increase this to sell a token, ensure that you have it reduced back to a minimum afterwards to protect yourself from any unintentional losses from later trades.
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