Upload bea.php script on any PHP7 capability web-server, visit relative URI, and go to ADM page for begin to manage your data;
PARANOID SECURE WAY: you can rename and put the script where-you-want in the webserver and require() from your web-page. In this way, an ipotetical attacker can't know the real position of BeA script.
Eg: rename bea.php in some-esoteric-way.php and put it in /mor3soteric/ directory on webserver, then put a require() on top of your index - or whathewher page you want, or a new .php page:
ops. have another brand-new web-site :))