Hi there

In response to your question, if you haven't gone through the full procedure of the application form technically you're not enrolled as a new candidate yet. Though as I don't know what's the message being displayed on your screen when you're not able to login through your first session login id details, it will hard to predict the root cause of the problem. Candidates in such situations should definitely make use of calling the the helpline number and asking the authorities concerned to assist them, which probably could identify what to do next

Hope this answer helps; best wishes