How to add search box with icon in custom wordpress theme without plugins -

i new wordpress . have developed theme in wordpress in header.php want add search box navigation bar . have tried alot not able add search box icon in header.php of developed custom theme of wordpress.

please me solve issue.

try download font-awesome fonts , stylesheet here , use class need specific icon :) you'll find more instructions on site.

edit1

1. in header section try add

   get_search_form () 

2.add following code searchform.php file (or create if don't have one)

<form method="get" id="searchform" action="<?php bloginfo('home'); ?>/"> <div> <input type="text" size="18" value="<?php echo wp_specialchars($s, 1); ?>" name="s" id="s" /> <input type="submit" id="searchsubmit" value="search" class="btn" /> </div> </form>