The Coupon Roulette add-on has the slices configured and set up by default. You can check the default configuration in the Preview tab of the add-on settings page right after the installation.
However, you can always change the slices' number and text to meet your business needs if necessary.
For this purpose:
Open the Slices tab of the add-on settings page.
To edit any existing slice:
Hover a mouse on the slice name. You will see the fields you can edit highlighted.
Edit the fields to your liking.
To create a new slice:
Click on the Create button below the slices list.
In the new line added to the slices list, specify the slice label as a customer should see it, the coupon code related to it, and the chance to get a discount. The higher the chance value is, the more opportunity a customer will get to win the coupon.
Your store will not create a coupon automatically after you specify the value in the coupon code field. Instead, ensure you add a related coupon as described here.
To delete a slice, click the Trash icon opposite its name.
Click the Save changes button.
The slices design you can configure in the Settings tab as described here.