What is the process of exit from first round allotments?

What is the process of exit from first round allotment ?

yes i am sure, if you don’t do anything automatic exit, infact i have myself done it many times.

Free exit.
Done by non reporting to alloted institution. Admission and candidature gets cancelled automatically.
Plus you’re eligible for second round AIQ.

Sir i haven’t been alloted any seat… I want to try in round with same choices…wat i shd do