Here is the Union Public Service Commission (UPSC) IAS exam applying procedure:

Candidates may apply online by using the UPSC website from 17 May, 2014 till 16 June, 2014.

Now the dates has gone but for your future i am giving procedure here:

Go to the official website of Union Public Service Commission (UPSC)
Click on UPSC ONLINE APPLICATIONS
Click on ONLINE APPLICATION FOR VARIOUS EXAMINATIONS OF UPSC
Now click on Click Here option for part I registration when will publish recruitment for IAS exam
Then fill all required info

IMAGE