Soldierdevil, maybe ... or maybe not. Actually there is no automatic reply with the url, but most forget to include it in the description of the problem and it's needed to be able to check, but great remark, thanks.
Yukito, the answer is: wrap your script that will perform the work of that page in the condition:
This condition works only for registered users, as a result the script will be executed only for registered users.
Do note that, for the condition to work, it must be written inside the template in the site's control panel. Conditions do not work in static files like index.html.