In the HCR, search for and open the new participant's participant profile. Their preregistration record is added to their profile on the Pre-Registrations tab according to what the package defined:

Opening this preregistration record will show you additional information, including the answers to the questionnaire defined by the package the parents selected for this participant. If any of those questions were Tracking Item questions, their answer will also appear under the Tracking Items tab on the participant's profile. 

Also an Order was created:

If you open up the Order, you will notice all of the fees that were applied during registration, including the payment method.

If the payment chosen was something other than a credit card, you'll see a payment with a value of  $0.00. Once you receive the actual payment, you will need to make sure you edit the payment to show that the payment was made and so that everything balances out.