When u r in a trade,u can place an order of limit sell wid trigger price.Like u entered long in SBI at 2300....ur initial stoploss is say 2275. Now as time goes and SBI continued to move up,say at 2330,u can now change ur previous limit sell order of 2275 to 2310 or what ever price.For dat go to 'modify' tab of speedtrade,and place ur new limit sell order wid stoploss trigger price.In dis case 2310 will b ur new trailing stop.