After you place an order, it will show that your profit is negative. This negative value is the spread, which is your transaction cost. When the profit value is positive, you earn as much as you can.

You can use GBP\JPY's: (closing price-opening price) * contract unit * lots = profit amount, and then convert the profit amount into US dollars.

So if you want to know your profit and loss, you can calculate it first or place an order before you look at it, and then discuss other issues with each other. If you haven't touched it before, I suggest you apply for a simulation first, and the problem can be solved after a period of simulation. At least you can master some experience in operating procedures and methods.

I hope it helps you.