1. Click "Settings".
  2. Click "Prepaid" tab.
  3. Now click "Add Prepaid".
  4. Enter your Prepaid name.
  5. Choose your Tax, if you don't want to give the tax then click "Not Applicable".
  6. Enter your "Prepaid Value".
  7. Now enter your "Bonus Value" what you are going to offer to your customer.
  8. Verify your details and click "Save".