Huh, that's a very good question. I don't know if you can. I looked around a little and I didn't see any way that you could, unless there is some hidden secret. This would be nice to able to do however, especially if you review something after the first few days and then you want to update your thoughts on it's durability further down the line.
_________________________________________________ -Brendan Trieb ..................... Member #6834 and proud of it