The submission Web page for Transitdata 2017 is https://easychair.org/conferences/?conf=transitdata2017. You should make a link to this Web page from your conference Web page. If you specify any other Web page, your authors will be unable to submit to Transitdata 2017. You can find this Web page when you log in to EasyChair for Transitdata 2017 and follow the menu items Transitdata 2017 -> Transitdata 2017 information.
You can always access Transitdata 2017 in EasyChair by logging in and following the menu items EasyChair -> My conferences.