Edit `./app/js/config.js`. Edit the ens-usernames dApp URL, and the API endpoint
*NOTE*: The server caches the .js/.css files, so in order to see the new changes, edit `./app/index.html` to point to a new version of the files, and edit `./embark.json` so the files are generated with a new name. Then, `embark build testnet/livenet` after changes.
To generate the codes, execute `node server/codegen.js`. This comand will output a `.\codes.txt` file, and the proof and merkle root used for the contract in `server/merkle.js`