You can set any values you want for rpcuser and rpcpassword in bitcoin.conf.What is rpcuser?Thanks for contributing an answer to Bitcoin Stack Exchange! Please be sure to answer the question. Provide details and share your research! Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. To learn more, see our tips on writing great answers.https://bitcoin.stackexchange.com/questions/5267/what-is-rpcuserThose values will be your username and password when you will be connecting to your bitcoind through HTTP JSON RPC