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create a custom theme settings in drupal7

create a file called theme--settings.php inside the theme folder in sites/all/theme we use the hook
theme_form_system_theme_settings_alter to add a settings for to default settings page

function hithin_form_system_theme_settings_alter(&$form, $form_state) 
 { 
$form["socialmedia"]=array (
 "#type"=>"fieldset", "#title"=>t("Socialmedia"), "#collapsible"=>TRUE, "#collapsed"=>TRUE ); 
}
read formapi for further details of the form