You first need to install webda-shell.
npm install -g webda-shell
This will install the webda shell tools, that allows you to configure and deploy your project You have the configuration UI available, where you can create a service, use a service, or create a custom API resource. You can also manually edit the webda.config.json if you prefer
Below is the manual step with the manual modification, I would recommand to use the configuration UI to modify the webda.config.json