As you want to get the process to apply online for the Indian Administrative Service exam so here it is for you:

(1). Firstly go to the official website of online web portal of Union Public Service Commission which looks like this image:



(2). Now on this page at the top you will find some tabs and from those tabs choose the tab of “ONLINE APPLICATION FOR VARIOUS EXAMINATIONS OF UPSC”

(3). Now you will be directed to the next page which looks like this image:



Now on this page you will have to do the registration of part I and then part II

Part I registration form:



Contact Details:
Union Public Service Commission
UPSC,
Man Singh Road Area,
New Delhi,
Delhi 110069
India

Map Location: