On the "Web Editor" page, click on the "Open Script" icon, or press CTRL+O.
A window will pop up. Go to the left side and select "Built-in" under "BOTS". This will filter scripts to show only the built-in bot scripts. Find the bot in question and click to open the script.
Script selection window
4. The script will load. On the left side, you can set up the exchange and market where the script is going to run its backtests.