https://developers.redhat.com/products/fuse/hello-world/#fndtn-karaf-runtime

In step 3 of the first section, we instruct the user to edit the users.properties file to change the username and password. Later on, when we were prompted by the UI for this information, the username field wasn't editable. If that's the intention, we should update the doc to reflect that they just need to edit the password.