The prices are shown top left next to the indicators' name.
This means you do not have to manually subtract or add ATR to price.
Line opacity allows you to show the lines where the ATR is, however, I recommend to keep this disabled.
Line type allows you to choose where ATR is calculated from (LowHigh or LowHighBody), the second ignoring the wicks, however LH is standard.
I also recommend to keep the other parameters as default.
I hope this indicator provides useful to you and your trading.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.