At present, you cannot make changes to an existing registration form. You must fill out a new registration form to update or renew your file. The system will automatically discard the old form. I have my resume in the database, but no one has called me. If you register from another region, and are not willing to re-locate, this could affect your employability.
Some positions have language requirements, or requirements for specific training or education.
The key words that you used to describe yourself could be a factor as well, so be sure that you have adequately described your abilities and training. Check to ensure that you have included a detailed resume. The system can only go by what you program into it, so please use all of the space available and think carefully about what is most important. Please keep in mind as well that there is a great deal of competition for government positions. It is not automatic when you register in the database that a job will be forthcoming.