If you have got your jAccount "myname":
1) you will have got a SJTU email as email@example.com, and you can login in http://mail.sjtu.edu.cn；
2) you can use SJTU wifi with jAccount myname and password;
3) you will have got a Cloud Disk as jBox, and you can login in http://jbox.sjtu.edu.cn;
4) you will login in many websites with jAccount, such as
When you login in ,please take notice of the logo "统一身份认证" and make sure the following interface.