Stop Loss !!

#1
Hi, Everybody
I'm new to this forum & also in stock market
I've hdfcsec trading a/c

I would like to Know how to place sell order with stop loss ??
Suppose I bought xyz @ 100/- & now want to sell it @ 120/-
but want to put stop loss @ 90/- (means if it goes down I'll quit @ 90/- & if goes up I'll quit @ 120/-.

Please guide me , Thnx in advance .
-Sunil