You can apply apply ONLINE using the website http:// www.upsconline.nic.in. Detailed instructions for filling up online applications are available on the above mentioned website. However you can also apply OFFLINE if you are residing in specified remote areas (only specified in Instructions) and send the application form to reach the “Controller of Examinations, Union Public Service Commission, Dholpur House, Shahjahan Road, New Delhi-110069” by Post/Speed Post only
You must apply in the Common Application Form devised by the Commission for its examinations, which can be purchased from the designated Head Post Offices/Post Offices throughout the country against cash payment of Rs.20 . Each such Form can be used only once and only for one examination.