You just have to fill out the form with your credentials like address, name, fathers name other stuff.You will asked about your NEET roll number. Fill out that too with some patience.Go through with the list of colleges under COMEDK while preparing your preferences like budget, seat availability, city. Research thoroughly about this step. It is quite important if you want the best you can get. You will be required to fill your preference order of colleges after they declare your merit rank or right away in your form(I am not sure about this, so check it out in admission brochure).After all these they will call you out for counselling while providing a counselling letter by online mode about a week earlier than counselling date. So regularly check their website to stay updated. You have to go there at the centre(not college, they will tell you your centre with date and timing in counselling letter) to get your documents(ORIGINAL) verified. You can check documents required in brochure. After that you need to visit the offered college to get done with admission fee payments and other fees.That was the last step and now you will be a future medico, CONGRATS!Good luck, be thorough with research about colleges and fill form with patience.