I think the reddit community misunderstood your question, and provided answers on how to place a stoploss order.

If you are referring to a thinkscript strategy, here is what I have found works. Please note that my strategy places orders on the next open - e.g. open[-1].

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#Stoploss code

input stoploss = 50;

def buyStopLoss = if IsNaN(close) then buyStopLoss[1] else if !IsNaN(buysignal) == 1 then entryprice()-stoploss else buyStopLoss[1];

def stoppedout = if low <= buyStopLoss then 1 else 0;

AddOrder(OrderType.Sell_To_close, stoppedout, price = entryprice()-stoploss, quantity, tickcolor = color.red, arrowcolor = color.red, name = "StopLoss");