Need help with short selling

i need to know the exact procedure how to do this type of order ! i have understood the basic of concept of it but i need to understand how to do that on the zerodha trader (nest) platform ! i want to know the margin required to be in my account for a particular share

One can check the margin require in the below link.

https://zerodha.com/margin-calculator/SPAN/

If you have any more doubts on this then write to [email protected].