Hi @Trashiv,
You need to activate the DDPI for placing a Forever Sell order and to enable seamless selling of stocks in your portfolio. Read more on how to activate DDPI feature here.
Once DDPI activated, you can easily place a stoploss order (Forever order) for your holdings, just follow the given steps to get started. Go to Portfolio > Select on a particular scrip > Tap on Forever > Choose single or OCO and place your target and/or stoploss as per your requirement.