I want to add two navigation for home page & innerr page in single page website,

please help me for creating secondary navigation and how to use theme in header.php and function.php
this is function.php section code>

register_nav_menus( array(
‘primary’ => __( ‘Primary Menu’, ‘olida’ ),
) );

and this is header.php code>
<?php
$template = get_post_meta($postid, ‘_wp_page_template’, true );
$menu_name=get_post_meta($postid, ‘dbt_menu_name’, true );
$menuid=get_nav_menu_locations();
if (olida_isMobile() == TRUE) {
$menuname = (ot_get_option(‘mobi_menu’));
if($template==”homepage-template.php”){
if ($menuname != ”){
wp_nav_menu( array( ‘menu’ => $menuname,’container’=>false , ‘menu_class’ => ‘nav navbar-nav navbar-right’, ‘walker’=>new olida_description_walker2()) );
}else{
if($menuid[“primary”]==0){
}else{
wp_nav_menu( array( ‘theme_location’ => ‘primary’,’container’=>false , ‘menu_class’ => ‘nav navbar-nav navbar-right’, ‘walker’=>new olida_description_walker2()) ); }
}
}else{
wp_nav_menu( array( ‘theme_location’ => ‘primary’,’container’=>false , ‘menu_class’ => ‘nav navbar-nav navbar-right’, ‘walker’=>new olida_description_walker1()) );
}
}else{

if($template==”homepage-template.php”){
if($menu_name && $menu_name!=”){
wp_nav_menu( array( ‘menu’ =>$menu_name, ‘container’=>false , ‘menu_class’ => ‘nav navbar-nav navbar-right’, ‘walker’=>new olida_description_walker2()) );
}else{
if(isset($menuid[“primary”]) && $menuid[“primary”]!=0){
wp_nav_menu( array( ‘theme_location’ => ‘primary’, ‘container’=>false , ‘menu_class’ => ‘nav navbar-nav navbar-right’, ‘walker’=>new olida_description_walker2()) );
}
}

}else {
if(isset($menuid[“primary”]) && $menuid[“primary”]!=0){
wp_nav_menu( array( ‘theme_location’ => ‘primary’,’container’=>false , ‘menu_class’ => ‘nav navbar-nav navbar-right’, ‘walker’=>new olida_description_walker1()) ); }
}
}
?>

Thanks