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Assuming you are flagging multiple users for an admin_level change via something like a checkbox, you would have something like this:

<input type="checkbox" name="change_id[]" value="<?php echo $row['id']; ?>">

The brackets after change_id indicate that this is an array, so now you have an array of user IDs that are subject to the change, under $_POST['change_id']

From there you can use IN() to modify your ‘results’ query along the lines of:

$sth2 = $conn->prepare("SELECT id, username, email, admin_level FROM users WHERE id IN(' . implode(",", $_POST['change_id']) .'");

Note: For the purposes of sanitization you would likely first want to make sure that $_POST['change_id'] exists and is an array, as implode() will return an error otherwise.