FBZX wii has 2 GUIs. One is accessible from the keyboard through the Function Keys (F1 for help) and one from the wiimote pressing the home button.
From the wiimote press 1 or A to select an item and 2 or B to come back to the previous menu. Press the “+” button to access the virtual keyboard which uses wiimote IR pointer or point the wiimote at the screen (it depends on the configuration).
For full details https://wiibrew.org/wiki/FBZX_Wii