Not sure what the issue is. I have completely deactivated the security plugin and cleared .htaccess file. The new log in URL is http://test.onlinearchives.net/wp-login.php
You should have admin access to everything. Do you mean the server itself or just to wordpress?
I am not sure what you mean by the editor. I’m not aware of any place to edit plugin files in wordpress.
You have the same level of access as I do. Administrator status.