If you haven't done so yet, you can register your account at https://www.mymealtime.com
Just enter a username and password, then click register and follow the instructions on screen. Once your account is created, you can add your student by clicking the Add Student button, then New. On the right, select Texas from the dropdown menu and start typing John Paul II High School in the school name box. As soon as you see John Paul II High School, Plano, TX in the list, you can select it. Enter your student's ID number and First Name, then click Add.
Once your student(s) are added, you can add money to their account with a credit card, schedule deposits in advance, see spending history, etc. You will also automatically receive low and negative balance alerts at the email address used to register your account.