There are several causes as to why you might be unable to sign-in.
Sign-ins are controlled by Cookies on your browser. Please make sure that cookies are allowed to be saved in our browser options. If they are you can try cleaning out your cookies and temporary files then try to sign-in again.
If you are still having trouble you can try our alternate sign-in page located at http://chat.buzzen.com/signin2.aspx
If you are still unable to sign-in please visit the Helpdesk and a staff member will assist you.