Code:
<?php

require_once('connect.php');

if(isset($_POST['but'])) {
	
mysqli_select_db($connect, "d");

$result = mysqli_query($connect, "SELECT name FROM find");

$row = mysqli_fetch_array($result);

$insert = "INSERT INTO but (sessionusername,onname,email) VALUES ('" . $_SESSION['username'] . "','" . $row['name'] . "','"
...