There is a remarkable amount of security coded into e107. For the beginner, the default file settings should be sufficient. If you are really paranoid about security, you can rename the directories; however, I would not recommend this unless you are comfortable editing PHP files. One of the things you can do is to make sure that the register_globals directive is set to On in your PHP installation. To verify this:
Select Tools | PHP Info from the toolbar or the PHP Info icon from the administrative interface. After selecting the PHP info option, if you see a blank screen then your web‑hosting service might have disabled this function from executing. If this happens you can ask your web-hosting support for the information. If the register globals are there and you have your own server then set them to On.