Updating the information in tracker artifacts is one important way that project members can work together effectively.
For example, when the work defined in the tracker item is completed, change its status from Open to Fixed.
Your tracker administrator may have set up work flow rules that constain your ability to do certain kinds of updates. For example, an administrator may have specified that only users with the "QA Engineer" role can change an artifact's status from Open to Closed.
A project manager might also change an artifact's priority, return it to the submitter for additional clarification, or assign it to a project member for resolution or action.
Generally, the project member to whom the tracker artifact is assigned will update the status. Any project member with the appropriate permissions can add comments.