Online church with children, Porn sites posting. help!

Hello,
I have an online church. Today when I checked the prayers every Christin can make and respond to I found 1 prayer going to a porn site. Also 2 other porn sites posted website that you could click on.
Posting porn on a church site is bad enough, now add your child going to church and finding the porn sites. We need to do something about this. I know it not just happening to my church.
I have the porn site address and the email they signed up with. Anyone have a great solution?