Add Search form in wordpress

have the code where ever you want

<...........form method='get' id='searchform' action='<.....?php bloginfo('home'); ........?..>/'>
<......div>
<........input type='text' size='18' value=' ' name='s' id='s' />
<.....input type='submit' id='searchsubmit' value='Search' class='btn' />
<....../div>