Isolate from the network?

I want to isolate one device, a wireless router, on our network from seeing the rest of the network. I just want this device to go out to the internet and nothing else. How can I configure my Peplink 380 to do this? I know Peplink has their own AP device, but it missing some functions that I need to have.

Thank you!

Peplink Balance is a router a layer 3 device. If you want to do some layer 2 operations such as MAC address isolation, you need to do it on a layer 2 device - your switch, not the router.