Add access point to guest network on Quantum router?

I am looking to add a wifi access point to the guest network on my Quantum router.  I already have an access points attached to my "regular" network, but can find no way to tie one to the guest network.  FYI I am using a Ubiquiti Picostation M2 as my wireless device for this access point.

Barring that, is it possible to set up this access point to act like a guest network, not allowing access to the other computers and devices in my house?

Thanks for your help!

- Steve