Design : 

Cari:

        <form name="form1" method="post" action="">
           <font color="#000000"><input type="text" name="txtcari" id="txtcari"></font>
           <input type="submit" name="Cari" id="Cari" value="Cari">
        </form>

Code:
       

         <?php

if(isset($_POST['Cari'])){  

    $cari=$_POST['txtcari'];

  $sql="select * from `$tbpengguna` where  nama_pengguna like '%$cari%'";

} else {  

    $sql = "select * from `$tbpengguna` where  `status`='$status' order by        `id_pengguna`   desc";}

         ?>