Hello,
Yes, its possible to remove the link altogether from the interface so that the users cannot see it or click it. Here are the steps...
1. Go to the following folder location: QPS Server > webabpps > WebHub > jsp > Headers.jsp
2. Take a backup of this file.
3. Open the file "Headers.jsp" and look for the following string: <a href="#" id="changePassword-dialog-btn" class="navigationlinks"><fmt:message key="label.changePwd" bundle="${messageString}" /></a> and delete it.
4. Save the file and restart the QPS Server.
Hope this information is helpful.
Thanks!