If you click on your "face" (next to the big green Submit button), on the bottom of the popup is the bar that shows how far along you are to the next level. Click on that bar. It will then take you to a page that shows where all your XP points have come from.
If you click on your "face" (next to the big green Submit button), on the bottom of the popup is the bar that shows how far along you are to the next level. Click on that bar. It will then take you to a page that shows where all your XP points have come from.