Canon SPEEDLITE EL-1 Advanced User's Manual page 79

3.
Push the joystick vertically to select an item.
Push the joystick up / down / left / right, or turn the <
either the firing frequency (1), firing count (2), or firing output (3), then
push the joystick vertically.
4.
Set the value.
Push the joystick to the left or right or turn <
push the joystick vertically.
Repeat Step 3 and 4 to set the flash frequency, number of flashes, and
flash output.
79
> to choose
> to set the value, then