So that your site performs as intended, there were a number of important operational (or system configuration) settings established by the developer during the setup phase. These settings include how often the site cache files are cleansed and whether users can register on your site or not.
The Global Configuration screen can only be accessed by users with Super Administrator access and presents all the fundamental settings required to ensure that your site runs smoothly. It can be accessed from the Control Panel or the site menu: Site | Global Configuration.
Having said this however, it is best to leave any changes to this section to your web developer.
There are three tabs within the Configuration screen: Site, System and Server. All of the settings within have been set up by your developer and should be left as they are. If they are changed, the front and backend of the site may go offline or some of its functionality will be affected. Approach with extreme caution if you are not familiar with any of these settings.
Outside the scope of the previous screenshot, which shows the three sections within the Global Configuration, within the Site section there is also the SEO Settings, seen in the following screenshot:
These settings were established by your developer and should be left as they are. Enabling settings that are set to No without some in-depth technical knowledge of .htaccess
among other things will most likely result in the incorrect presentation of your site.