How do yo know that how many total wins you had in club penguin?

If you want to know how many games you have played, you're going to have to keep track yourself. But if you want to know how close you are to getting your next belt: They added something to show what percent you are at in getting a new belt. for example, if you are a blue belt it might say 64% done to getting a red belt. So you can check that out, just click the icon with the 3 cards in the bottom right corner of the screen when you are in the dojo.