The UPSC Civil Services Mians 2013 examination Detailed Application Form submission is live on the upsc website and can be directly reached from the link below
The last date of submission is 10/09/2013
To quote the notification accompanying the form
The printed copy of online application form must reach the Under Secretary (CSM), Union Public Service Commission, Dholpur House, Shahjahan Road, New Delhi-110069 on or before 18/09/2013 The envelope containing the application should be superscribed “Application for Civil Services (Main) Examination, 2013”. Application can also be delivered at Union Public Service Commission counter by hand. The Commission will not be responsible for the applications delivered to any other functionary of the Commission.
Please do make sure you read the complete notification and fill the form soon and send it to UPSC. For any clarifications you can contact UPSC directly. Again quoting the notification for this
In case of any guidance/information/clarification regarding their applications, candidature etc. candidates can contact UPSC's Facilitation Counter near Gate ‘C’ of its campus in person or over Telephone No. 011-23385271 / 011- 23381125 / 011-23098543 on working days between 10.00 hrs. and 17.00 hrs. CANDIDATES CAN ALSO OBTAIN INFORMATION ABOUT THEIR INTERVIEW PROGRAMME, RESULTS ETC. ON THE COMMISSION’S WEBSITE AT THE ADDRESS :— http://www.upsc.gov.in.