- Copy the entire code of the demo gadget: MediaWiki:Gadget-Demo.js;
- Paste it into your common.js;
- Adapt the code to your idea by following the comments;
- Refresh the RecordWizard and test your new generator.
Note: currently, only users with administrator right can do it. In the future, it will be possible to test new generators for everyone.
Once your code is ready and if you think it can be usefull to other people, you can ask an admin (on the Chat room) to move it to a gadget (available for those who activate it from the preference menu) or directly inside the RecordWizard (available for everyone).