Trailing SL order

I am trying to add a Stop loss order and trail it. Whenever I execute the SL-order it gets executed in current market price and my trade gets closed. I did try learning the nuances of order placement from Fyers-youtube channel but still i fail. Can somebody help me in this.

Today i first tried placing a cover order for my option buying @Rs 161 for a value of Rs 4025 but still i got an error rejection of margin shortfall. Then i placed a separate buy order Rs 156 and tried to place a trailing SL order, the same got executed at market price (sometimes i need to watch the screen and have to get out of it manually). Please help me with this bit of trailing SL if i have change anything in the settings.

cover order.png
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individual order.png
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