Help with Yanfly Class System

Hi. I'm pretty noob of rpgmaker and meganoob of scripting.
I'd be vry happy if you could help me to edit a little thing in the Yanfly Class sistem mechanics (Version 1.10).

I set this :

SWITCH_ENABLE_CLASS    = 1

to making the choice disabled at the starting of the game.

But i have reached a point when the option of changing should be enabled.

How can i do that?

I've read to bind it to a switch, and I try to do it, but without any result as you may suppose



Thanks again

{EDIT} Nevermind. I don't think this will work. I'll try to think of something else.

Spoiler for old post:

Try this.

Code: [Select]

SWITCH_ENABLE_CLASS = !$game_switches[1]