I fixed the variable assignments and added switching of timeframes over indicator inputs.
To switch timeframes click on the indicator, open its settings and switch the timeframe to either monthly, weekly or daily.
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.