Canon Speedlite EL-5 Advanced User's Manual page 164

Registering Custom Flash Modes
You can register current Speedlite settings such as general flash functions, Custom
functions (except C.Fn-00) (
assigned to < >–<
1.
Press the <
2.
Select <
3.
Choose a Custom flash mode to register the settings to.
), and Personal functions (
> modes.
>.
Press the joystick vertically or horizontally or turn <
< >, then push the joystick straight in.
Press the joystick vertically or horizontally or turn <
< >, <
straight in.
) as Custom flash modes
> button.
>, or <
164
> to select
> to select
>, then push the joystick