after you have sorted out the mysql problem you may want to redo things slightly:
PHP Code:
<?php
$sql = "SELECT * FROM ALS_signup";
$result = mysql_query($sql, $conn) or die(mysql_error());
echo "<select name='test'>";
while ($newArray = mysql_fetch_array($result)) {
$username = $newArray['username'];
echo" <option>$username</option>";
}
echo "</select>";
?>
otherwise you will be creating a select box for each username.