If your buy or sell order is not properly completing (typically with an undefined error), simply increase your slippage tolerance. Typically, you don't have to increase it to any more than 2% (but the lower, the better -- most swaps don't require more than 1.5%). If that doesn't help, you can also try swapping rounded numbers, for example 10 $MUTE instead of 9.871342046815302394
Click on the gear icon
WARNING: Setting the slippage higher than 2% will increase the chances that front running bots will target your transaction.
Enter 1.5 or 2 in the right-hand (custom) slippage field
Click anywhere outside of the "Transaction Settings" dialog to close it and verify your slippage is set to 2% or less.