You are free to open new orders without any guidance as many as your available funds allow.
But be reminded that you have only 72 trading hours to close the orders by yourself. Otherwise, they will be closed automatically. You will be able to see the timer on the page of the promotion:
Lot volume for the orders in this step is limited only by available funds. You can set Stop Loss, Take Profit or activate Pending order (note that you can set pending order not later than 20 minutes before 72 trading hours are over).
In this step try to get as much profit as you can. More you get - more you will be able to withdraw after you trade the needed amount of lots on your deposit.