The Dice Roller options are:

• Number of dices rolled
• Modifier: That can be a positive or negative number, and is applied before the multiplier
• Multiplier: After you get the sum of the dices plus/minus the modifier, they multiply this number
• Number of rolls
• Target Number

You can also press the button to show the individual dice values or just the final one, after all modifiers and multipliers have been applied, the engine will tell you how many successes and failures you had, and by how much, based on your target number.