法人登录: If your unit has been registered after the unified work permit system your login is 18 characters long (number and letter mixed)
According to your situation use your old login and old password in the right type
If you can't log in try to add WP_ before your login name.
If you login into the wrong category the system will tell you to choose the right category, so you can make some tests.
Be advised that after 6 failed tries, you will get blocked for 30 minutes for safety reason
If you forget your password you can find it in your browser history and if not you will have to use the 找回密码 option.