You have to fill the address which is mentioned in your I'd proof like Adhar card . Or if you're not living in the address mentioned in your Aadhar then you can also fill the address where you live just you have to know the pin code of the area

You need to enter address as per Id Proof you shall privide like Ashar Card or Any other suitable iD proof so counselling authorities can verify address. 

If you are belinging to state quota uou might be asked to produce Domicile as document as well. 

https://medicine.careers360.com/articles/neet-application-form