There is no recommended symbol to trade, you need to find a symbol you wish to trade and learn how to optimise the settings, there will be times when the market conditions for the symbol are best to stay away, like high volatility due to world events. Optimisation (data fitting) just helps increase your chances, you will not get the same results with live trading.
The product page has all the information you need to get started using this system, the link below will help you, spend some time studying the material.
https://clickalgo.com/grid-hedge-robot
Take a look at the hard facts of algorithmic trading, you will need to have a solid understanding of trading the markets to use a semi-automated trading system.