You can do so by adjusting the golden slider.
2. Select "Market Order", and type in your order quantity
The profit/loss will initially be negative, since you used a market order and paid a fee of 0.075% ($0.75 per $1000 order size). To avoid this, use a limit order instead. Limit orders do not pay fees, and are provided a 0.025% rebate instead. Do note that, unlike market orders, limit orders rarely get filled instantly.
Mushino lets you chart your profit/loss over time.
Note: We can't guarantee that you will be profitable. That's up to your skills as a trader!