anyone who knows how to change the class of the

sub-child??

sample:
<ul class="sub-menu">

<ul class="sub-menu"> -> this is it??..how to change tha class??

Looking at what I can see of your example, to target it using CSS is pretty easy really, if I’m reading it correctly.

ul ul.sub-menu ul.sub-menu {
    /*  Styles go in here.  */
}