You must configure at least one network policy before you can create client mode profiles. For more information, see About Client Mode Profiles.
You can set a radio on some AP models to client mode, which allows the AP to connect to existing open and PSK wireless networks, including third-party networks as a generic BYOD client. The method described here is recommended because it is often the fastest way to perform this task.
There must be at least one client mode profile configured before you can define a LAN-side AP radio for client mode. See Configure a Client Mode Profile.