You can charge individual attendees by clicking the green charge my account button in the payment section of their registration.
Or, follow these steps to charge them all at once:
- Go to the Event → Registrations → Payments
- Review the list, make changes, and scroll down to click the preview button
- Double check the list and click the charge all accounts now button
- Confirm that you want to charge the accounts now.
Remove attendees from the payment processing queue by unchecking the box in front their name prior to clicking the Preview button.