Sorry to have confused you, as i suppose you will demo trade with a free Zorro license, then you must use two instances. One with Z1 and the other with Z2.

Run them, learn the mechanics of Zorro and wait for the next step.

If you cannot afford to trade all Z1/Z2 assets, you can disable some of them and trade EURUSD and USDJPY for example.

This is explained here at the end:

http://www.zorro-trader.com/manual/en/zsystems.htm