ssid with separate ip range

Good evening I’m new to unifi equipment and i trying to setup a network i have a usg ,cloud key and a 24port edge switch in one location i then have loco m5 ptp to a separate building in that building i have a unmanaged switch and connected to that is unifi access point i need that access point on a different ip range any advise

If you don’t have a managed switch then VLAN traffic for separate sub nets probably won’t pass across it