Procedure for changing ICPC Team composition after qualifying for Onsite round

Can someone tell me the procedure in detail about how to change icpc team composition after qualifying for onsite round. One of our college’s team has qualified for Amritapuri Onsite Regionals & their third member will not be able to attend the Onsite round. So how should we proceed towards ?

Please tell the whole procedure for changing Team Composition.

Inorder to change the team composition you have to first confirm your onsite promotion, by completing the formalities of payment and confirmation for attending the regional.
After that you can change your team composition at the time of team registration for onsite round, team registration for onsite is done separately after your team promotion to onsite round.
This was the procedure for amritapuri onsite regional, it may or may not differ for other sites.