you should also put a stop loss on every trade you make, its just good risk management. the market can suddenly reverse direction, so the stop loss is what stands between your entire account balance being wiped out and you still having some money to enter another trade of the current one goes bad.
I see you are using a demo account that's why you are not inserting a stop loss but when trading with real money, not using a stop loss can result in you blowing your account.