In the chat, use the special command
/r) followed by the formula for the roll you wish to make, for example:
/roll 1d20 will roll a d20 dice.
Bonfire's dice is based on the RPG Dice Roller library, most of the commands you'll find there will be applicable to Bonfire.
Basics of rolling
|Standard 20 sides dice|
|Roll multiple dice|
Refer to the dice documentation for details on all available modifiers.
4d6!k2will combine the Exploding and Keep modifiers.