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changed the php file as instructed and still not able to get in.

I assume you mean that you renamed main.php to main.php-bak. If this is the case then Admin Tools' code is no longer running on your site. Therefore whatever problem you have is not related to Admin Tools.

I forgot the generated admin page and need to recover it

I'm not entirely sure what you mean by that. Do you mean a secret URL parameter for the administrator login page, e.g. http://www.example.com/administrator?something If this is the case, as I said above, renaming main.php means that Admin Tools code no longer runs on your site therefore it doesn't try to enforce that secret parameter.

If, however, you mean an administrator directory password then you need to delete the .htaccess and .htpasswd files in your administrator directory (NOT your site's root!) to remove that protection. Do remember that, as the documentation tells you, this feature is implemented at the web server level, not at the PHP level, meaning that renaming the main.php file has no effect.

If you mean something else please specify so I can help you.