Go to www.upsc.gov.in for the official IAS registration form.
Click on the 'New Registration' link to create your account.
Enter your personal information like name, DOB, nationality, etc.
Fill in your educational qualifications, including your degree & university.
Select your preferred exam center for the preliminary exam.
Upload your recent passport-sized photograph and signature.
Double-check all the details before final submission.
Pay the required fee through online payment methods.
Click 'Submit' after completing all the steps & saving your application.
After submission, take a printout of the application for future reference.