There was an example script "Simulate" but it is not anymore in the Zorro installation, I dont know why.

You write a normal trading script but instead of generating a trade signal, read a trade out of your list, open the same trade in the script, set Fill mode so that it is not immediately filled, and then set all the trade parameters, profit and entry and exit dates from the trade off the list. The backtest will then generate a performance report from your set of trades.