Embedded Dice Support - Page 11 Ignoble says...
You Can Re-roll
I have just coded in a feature requested by Dashain and indirectly by some Players to enable you to re-roll your Dice.
Please keep in mind this option works when you have already made your Dice Rolls and you are still within the 30 minute period.
The feature deletes your entire Roll so you can start over ANY number of times so long as you are within the 30 minute period, therefore please follow the directions given on the Edit screen and use with discretion.