1. Yes, you can remove a winner after the winners have been updated.
2. You only need to update the winner again with 0 rewards. This means you go the Update Airdrop Details tab, put in the airdrop smartcontract address, put the user’s wallet address in the winners tab who you want to remove, put 0 in the rewards tab and then click update.
3. You can also remove multiple winners with the same method. Multiple wallet addresses need to be separated commas and there should be as many comma separated 0s as the number of winners.

*We are not responsible for failed transactions.

This transaction does incur gas fees.