The profit chart shows the balance of the quote during the selected period of time, for the selected pair. In the next example you can see the zero line between the green and red candles. The total amount of BTC you hold there, will be the point where it starts calculating. The bot opens a position and in the same week it closes that position again, with profit, which is marked by the first bar (green). Then the bot opens a new position, it doesn't close it during the next week, which is marked by the second bar (red). In the third week, third bar (red), it closes the position and opens a smaller one. Week four shows that it closed the position again and made profit compared to where it started the first week. From mid June it opened a position that it still hasn't closed till today.