There isn't a logout button. Just add a link to the logout button wherever you want it.
It looks like you didn't download my update. Your line 24 has:
$WAFV_Errors .= WAValidateEL((isset($_POST["Log_In_group_2_Password"])?$_POST["Log_In_group_2_Password"]:"") . "",6,500,true,3);
I had updated it to:
$WAFV_Errors .= WAValidateEL((isset($_POST["Log_In_group_2_Password"])?$_POST["Log_In_group_2_Password"]:"") . "",3,500,true,3);