By default, the script does not mark any of the detected patterns on the chart. You will have to open the indicator settings and enable the patterns you would like to see on the chart. There are also three tick-boxes that let you to enable/disable all the selected / /neutral patterns at once, i.e. if you would like to only see patterns, you can disable all the and neutral patterns at once with the corresponding tick boxes. When you enable patterns again, the script will show your selection of patterns again on the chart.
When you hover on the tool-tips with your cursor, a short description about the pattern will be displayed.
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.