At precisely 6:00 pm every evening (except Shabbos), your son can recite any pirkei tehillim for 10 minutes. After 6:10 pm, call the Pirchei Agudas Yisroel Hotline at 718.663.0212, and, using option 9 (message box), leave his name and phone number and state it is for the tehillim program. He will be entered into the raffle of the day. Your son has until 6:00 pm of the next tehillim day to enter his name.
If your son prefers to say the tehillim along with us, live, he can call the hotline at 6:00 pm EDT, at 718 663 0212 and dial 611. He will then be able to say tehillim along with us live.