You can copy paste the code or refer the screenshot.
Please make sure everything is in order as seen in the screen shot below. Make sure there are 4 spaces before "strategy.entry" and "strategy.close". Also change the "Order size" to 100% equity in settings(screenshot in the bottom)
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//@version=4
strategy("My Strategy", overlay=true)
change= ((close-close[1])/close[1])*100
rsic= rsi(close,3)
if change<-5
strategy.entry("long",strategy.long)
if rsic>50
strategy.close("long")