On May 6th, when the fork occurs, what do I need to do?

You will need to manually stop mining at 1800 UTC on May 6th and switch your script to change to the new miner and parameters, and then reconnect. If you are running a desktop wallet, you will also need to update that in order to stay on the right chain. Just make sure you are using the latest release of Ravencoin , which must be 4.1.0 or higher. Assuming all goes well, around the fork time the new algo will come into effect and we will start mining with the new algo. For a brief window of time, it is possible that both algos may be mining the network blocks, but that will quickly give way to 100% kawpow hashing.