Participating in a challenge doesn't cost you tokens even when the challenge you voted in is unsuccessful. You can reclaim your voting tokens from unsuccessful challenges.
To reclaim tokens, make sure you're first logged into your MetaMask account
- Select up to 6 challenges from which you'd like to reclaim your tokens
- Press “Reclaim Tokens” button to complete your transaction. This will open a separate window where you will be asked to confirm.
Note that this will require paying a transaction fee called Gas, which is paid in Ether (ETH) for your transaction to be processed. Learn more on gas here.