functions.php

//Forged Settings
function forged_settings_add_options(){
    add_options_page( 'Forged Settings', 'Forged Settings', 'manage_options', 'forged-settings', 'forged_settings_page');
}
add_action( 'admin_menu', 'forged_settings_add_options');

//Create Forged Settings Submenu
function forged_settings_page(){ ?>
    <div class = "wrap">
        <h1>Forged Theme Settings</h1>
        <form method="post" action="options.php">
            <?php
                settings_fields( 'section' );
                do_settings_section ('theme-options');
                submit_button();
            ?>
        </form>
    </div>
<?php }

//Twitter
function setting_twitter() { ?>
	<input type="text" name="twitter" value="<?php echo get_option( 'twitter' ); ?>" />
<?php }

function forged_settings_page_setup(){
	add_settings_section( 'section', 'All Settings', null, 'theme-options');
	add_settings_field( 'twitter', 'Twitter URL', 'setting_twitter', 'theme-options', 'section');
	
	register_setting('section', 'twitter');
}
add_action( 'admin_init', 'forged_settings_page_setup');