If you are using CorePlus, the wifi.tcz
is already included in the iso.
Boot to GUI and click the wifi icon in the bar (wbar) below.
Or you can switch to CLI and run
If you are NOT using CorePlus iso.
tce-load -w wifi.tcz
tce-load -i wifi.tcz
All the pre-compiled firmwares are also included in the CorePlus iso, and will be loaded by default.
Note that you don't really need all of them, just the one that fit your hardware.