Guest network

Hello,

I am a new xfinity customer and just had everything installed last week, including free installation which was great! Unfortunately I am having trouble setting up a guest network like I did when I had Quantum fiber from AT&T. A guest network is essential for home private network security, how do I enable this? I don't really want to go back to Quantum fiber, but might have to if I can't get a guest network going.

Thanks!