Diggit Drupalextras

Hi

I've had a search around but can't find anything on this.

I've installed FCKEditor, WYSIWYG, IMCE and IMCE Bridge and all is working well but I'd like to limit which content types it works on.

I really only want it wokring on Forum posts, Blog posts and maybe Book posts but not comments etc.

Is there some way to limit which content types the WYSIWYG editor works on?

Thanks