1st step: Give the person 5 stars. (Just for knowing where the +5 tag is. Just temporary.)
2nd step: Move the cursor to the left most star, the cursor should become something like a hand.
3rd step: Move the cursor to the left a bit, that's the place between the [+5] and the left most star.
4th step: The cursor should still be something like a hand, *Click*, complete!! +0 tag replaced the +5!!