Hi, unfortunately this report is not very useful because it does not describe the problem well. If you have time and can still reproduce the problem, please read https://developer.mozilla.org/en/Bug_writing_guidelines and add a more useful description to this report.
This was just a test of the Bugzilla REST API. I apologize for the inconvenience. Unfortunaltey, I could not find a way to create a user for myself on the Bugzilla test server.
For future reference, https://landfill.bugzilla.org/ might be a good choice for testing.