When you are at the main Race or Die Home screen go to Stats, which is the orange tinted option at the very bottom of the right hand column. Once in the Race or Die stats you will see all of your statistics for your Race or Die account. This is where you will see things like how many experience points you will need before you get to the next level, how many fights you have won or lost, different achievements you have made, and car parts you have purchased.
At the very bottom of the Race or Die Stats page, directly under your Estate, will be the Reset button. Press it once and you will be asked if you are sure.