Example of how to add children to the homepage in ProcessWire. See: http://processwire.com/talk/topic/3065-direct-children-of-default-front-page/.

gistfile1.php

<?php

// Get the homepage
$homepage = $pages->get("/");

// Get the all the children of home
$children = $homepage->children;

// Get all the homepage children who need to be under home in the menu
$homePageChildren  = $homepage->children("homechild=1");

// Remove the children you want to use as homepage
$children = $children->not("homechild=1");

// Store this in a variable so you can output it later
$homeMenu = "<ul>";

// Loop through the homepage children and store them in the var
foreach($homePageChildren  as $homePageChild) {
    $homeMenu .= "<li><a href='{$homePageChild->url}'>{$homePageChild->title}</a></li>";
}   
$homeMenu .= "</ul>";

// Start the actual menu here
echo "<ul>";

// Create the link to home and output the $homeMenu
echo "<li><a href='{$homepage->url}'>{$homepage->title}</a>{$homeMenu}</li>";

// Loop through the normal children
foreach($children as $child) {
    echo "<li><a href='{$child->url}'>{$child->title}</a></li>";
}

echo "</ul>";