killerhaii, I think he's/she's refering to his/her url would be yourdomain.com/pedit.php which would bring up the members edit page and this is where he's having an issue with the calendar and other items.
Now, if the calendar is appearing and not allowing anything except for 0/0/0000 then that is one thing. However, this may be an issue of the items he/she wants to edit is simply not appearing to be edit such as text boxes, status, location and so on. In this instance, he/she would need to go to admin => Builders => Field Builders =>Edit Profile and ensure that the fields that they want to edit are actually marked to appear on the yourdomain.com/pedit.php page.
Now, if the webmaster is trying to do this through their FTP Client, well then that would just be something that I would love to sit back and watch, as I'm sure the rest of you would too!