Visit the official UPSC website: https://www.upsc.gov.in
Open the “Examinations” section
Click on the NDA & NA Examination 2023 notification
Read the official notification carefully
Register on the One Time Registration (OTR) portal if not already registered
Log in using your OTR details
Fill out the online application form
Enter personal, educational, and contact details
Upload the required photograph and signature
Select the exam center and other required preferences
Pay the application fee online, if applicable
Review all details before submission
Submit the application form
Download and save the confirmation page
Take a printout of the submitted application for future reference