You have not clearly explained your query, but still by assuming i will try to answer it.
Applying to Aadhaar is Voluntary Decision of Citizen. So if you are planning to get one, then you will have to enroll yourself for Aadhaar which can be done by visiting Nearest Aadhaar Services Enabled bank’s or post offices.
Once you get enrolled for Aadhaar, you would be provided with Aadhaar Enrolment Receipt which would contain enrollment id. And after verification of your details submitted you would be issued with 12 digit Aadhaar Number and the Aadhaar Card would be dispatched to your registered address. Not down that this process could take almost 3 – 4 weeks.
Hope i have solved your query, in case if you have further queries do reply back.