Hello, 

As per your question, According to the rules provided by mci for counseling, you can register for second round directly,  if you hven't registered for first round before. Candidates who didn't get chance to register in first round can register for second round when fresh choices are to be selected after first round and can choose their college freshly. 

You can check the rules and regulations given in the official site of mci even. 

Good luck