Hello,

Once you login with your JEE main credentials details which were previously entered while filling JEE main will be displayed on screen such as  personal details , contact details and academic details.You need to cross-check the details.After that you need to give additional details like language of exam, examination centers, alternate phone number and email ID other than those which are given in JEE main.After tha you need to upload documents such as class 10 certificate, class 12 certificate and category certificate (if applicable).After uploading the documents you need to make the payment of fee.