Yes, you can. However, your order won't be placed immediately.
When will my orders be placed?
Assuming you have enough funds, if you invest within market hours (10am - 4pm weekdays), the order will be placed immediately. Otherwise, it will be queued and placed around midday of the following market open day.
What's the difference between queueing and placing an order?
Placing is when we submit an order to our brokerage partner. Queueing is an internal system that automatically places an order once you have enough cleared funds. You can queue multiple orders back-to-back and they will be handled in the order they were queued.