The first thing to do is to reset the password through the IT department website.
In case you cannot login immediately after changing password, it can because of the fact that your user has been locked after attempting to login with a wrong password. In that case, you need to wait half an hour before you try to log in with the last password you made.
If you have followed these steps and still don't manage to log in, you can contact SHEMA at 03-531-7000 for further assistance.