Hmmmm, I am not familiar with that one and do not see it on the USCCB listing. You might ask your Diocese office of Faith Formation if there is a companion text on prayer.
I’d suggest you might want to read the section on Prayer in the Catechism, then pick up a copy of “The Prayer Primer” by Fr Dubay. It will give you a good foundation to speak about prayer, both formal prayer and other forms.
As Confirmation class has students who are able to read, I would give them homework! Ask them to find out where we get the words for the Ave Maria and the Our Father. Send them on a quest, it will get their hands into Scripture!!