User login password error [closed] - php

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I am trying to create login system with access level but i the bellow code always shows please enter you password. please help me where i am wrong.
session_start();
if(isset($_REQUEST['submit'])) {
$username=$_POST['username'];
$mypassword=$_POST['password'];
if($username){
if($password){
require('conn/iclude.php');
$password=sha1($password);
$query=mysql_query("SELECT * FROM admin where name='$username'");
$numrow=mysql_num_rows($query);
if($numrow==1){
$row=mysql_fetch_assoc($query);
$dbid=$row['id'];
$dbuser=$row['name'];
$dbpass=$row['pass'];
$role=$row['role'];
if($password==$dbpass) {
$_SESSION['username']=$dbuser;
$_SESSION['useridid']=$dbid;
if($role == 1){
header('Location:admin.php');
}elseif ($role==2) {
header('Location:1/neasp.php');
}elseif ($role==3) {
header('Location:2/index.php');
}elseif ($role==4) {
header('Location:3/index.php');
}elseif ($role==5) {
header('Location:4/index.php');
}
}else{}
}else{
echo"Hello World";
}
}else{echo "You must enter your password";}
}else {echo "You must enter your name";}
}
thanks below is html form

Answer 1

$mypassword=$_POST['password'];
^^^^^^^^^^^ **MY** password
if($password){
^^----no **MY**
If your system was properly configured for debugging, e.g. display_errors and error_reporting turned on, you'd have gotten warnings about using undefined variables. A development/test system should *NEVER have these settings off in the first place.
You are also vulnerable to SQL injection attacks. Enjoy having your server pwn3d.