As you want apply online for appear in UPSC IES ISS Examination, so on your demand I am telling process for it:

Before applying online you have to scan the copies of photograph & signature.

Take visit on UPSC official website

Click on “Online Application for Various Examinations of UPSC”.

Click on “Part – I/ Part – II Registration”.

Read the Important Instructions & fill the form with all the relevant details & submit the application form.

After successful registration, a unique registration ID will be allotted, note down the ID & password.

Now fill the personal profile, contact details, age relaxation if applicable.

Now fill the details of qualification, experience.

Now fill the details of Professional Registration, Language, Miscellaneous Module.

Now you have to choose the Recruitment Test Centre.

Now you have to upload documents in Document Upload Module

After uploading photograph & signature preview the ORA form and check the details carefully.

Now click on the submit button

You can Pay Online using the Internet banking facility in SBI or other associated banks or can pay through Visa/ Master Debit or Credit card issued by any Bank/ Institution.

Here the Transaction ID & Date of Registration details will directly uploaded automatically.

Now pay the fee through cash at any branch of State Bank of India through the Pay-in-Slip

A transaction ID will be given, again revisit the website and click on the “Click here to view your Previous/ Currently active applications”.

Log in by registration ID & password, you can see “My Active Application (My draft Application)” link.

Now fill the details of transaction ID and Date of Transaction if paid through cash.

Click “Continue”, check the details of fee and submit the application.

Now take the printout copies of application attach the attested copies of all documents and keep it for future use.