More info is available at https://crowdwiz.smirnov.com.
Use this app to swap your WIZ for ETH. More info here.
I took a few days to experiment with Web3 and Veutifyjs, so this app just a side effect of my desire to research new technologies. If it doesn't work, just use the good old etherscan.
The refund is done in stages.
Use below form to execute the round A refund. It is done in two steps. First step is to unlock the tokens, and second is the actual refund.
Enter the amount of WIZ to unlock. Once you click the Unlock, wait for transaction to get confirmed then click refund.