Hi megapixel,
Sure. The breakeven is basically the amount you need to cover in order to not lose money on the trade. So in your example, you entered a buy price of 1066 and the breakeven came out to be 2.97. That means, to break even, you have to have a sell price of 1066+2.97 = 1068.97. If you type in 1068.97 as your sell price, your PnL comes exactly to 0.0. Any sell price higher than that will net you a profit.
By default, the breakeven works on the buy price. If you leave the buy price blank and fill in only the sell price, the breakeven will work in the opposite situation (i.e. what is the amount you need to buy at to not lose money on the trade). If you blank out buy price and enter a sell price of 1500, your breakeven shows 4.17. That means, your buy price needs to be 1495.83 (1500 - 4.97) or lower in order to breakeven or make money on the trade.
Let us know if that helps