Check the official UPSC notification for the exam you want to apply for
Visit the UPSC Online Application portal
Register as a new user if you are applying for the first time
Fill in your personal details, contact details, and educational details
Upload the required documents, photograph, and signature in the prescribed format
Select the exam and exam center options, if applicable
Pay the application fee online or through the allowed offline mode
Review all entered details carefully before final submission
Submit the application form online
Download and save the confirmation page and application receipt
Keep checking the UPSC website for admit card and further updates