Negative balances
TO GET A LIST OF STUDENTS WITH NEGATIVE BALANCES:
Click Reports -> Customer Balance List:
Then check the box for "Negative" balance, and optionally, choose grade level; then select all "price groups" because I wouldn't necessarily guarantee that every kid is properly designated as a kid. Then click the "Export" button.
Then pick your export type (it can do PDF, Excel, CSV) and click the "Export" link:
TO CHECK THE BALANCE FOR ONE KID:
Go to Customers -> Customer Information:
Type in the kid's last name and search; annoyingly, scroll down aways to the "Account" section to see their current balance: