Yes you can, but for any such changes, you need to physically report at a reporting centre after your college allotment ( whichever round it be) and do the entire procedure again. Often opting for float is the best option if you are not particular about any one college. Best of luck for counselling 

Hello Deepak Kumar Choudhary !

Can you please elaborate your question so that i can provide you some asistance. From the given question I can not interpert anything. Please comment below with some more information. If you mention the type of institute you are talking about then I can provide you some assistance.

Feel free to ask further.