Will you please tell me from where I can register for Part 2 Online Application form for UPC Exam????

Currently there is no Examination notice for UPSC so Part 2 form is not available but still here I am giving you procedure to reach at that page where you can get in near future

Go to the official site of UPSC
At the right vertical bar of home page click on - UPSC ONLINE APPLICATIONS
New page will open and at this page click on - online application for various examinations of UPSC
New page will open which look likes below image



Currently there is no Examination notice for UPSC is available so part 2 form is not available here
But whenever any exam form will release, you will find on this page only