A parent's sentry account is set up by the student through webster.bradley.edu . After logging into Webster go to the Sentry tab at the top. From there you can add new accounts by clicking add person or change the password for existing accounts. Select change password on the corresponding account. Enter a new password and hit change password.
After changing the password your parent can go to sentry.bradley.edu and enter the student's BUnetID, the account name (the name for the person on Webster) and the new password.