To apply for the UPSC Civil Services Examination, you can follow the steps given below:

•  Visit the official website of the Union Public Service Commission (UPSC) at https://upsc.gov.in./ Click on the "Apply Online" tab.
•  Click on the link for "UPSC Civil Services Examination" and read the instructions carefully.
•  Fill in the required details in the online application form, including your personal information, educational qualifications, and contact information.
•  Upload scanned copies of your photograph, signature, and other required documents.
•  Pay the application fee through the online mode (debit/credit card, net banking, or e-challan).
•  After submitting the application form, take a printout of the confirmation page for future reference.

The application process usually starts in February or March every year, and the last date to apply is usually in March or April. The exam is usually conducted in three stages: Preliminary Examination, Main Examination, and Interview. The Preliminary Examination is usually held in June, and the Main Examination is usually held in October-November. It is important to keep track of the official UPSC website for any updates or changes in the application process or exam dates.