I have also set the permissions to 777 and still no success

I have also set the permissions to 777 and still no success

Never ever set permissions to 777 it's a major security risk. It opens up your server to be writeable from the internet.

I am getting a 403 forbidden error when I try to go to the link.

Does the error log say anything,

can you access for example README.md

403 forbidden error can be caused by lack of index.php file on the root site directory. Check to make sure you have index.php. If not, make a new file with a file name Index.php and paste the code bellow:

<?php
$autoload_path = __DIR__ . '/vendor/autoload.php';
$autoload_available = include_once($autoload_path);
if (!$autoload_available) {
    die("Couldn't include '$autoload_path'. Did you run `composer install`?");
}

return \Elgg\Application::index();