How to install and using Joomla!
The Joomla! Project is pleased to announce the immediate availability of Joomla 3.0.0. This is the next major release of the Joomla CMS in the Standard Term Support (STS) track. All 3.0 users will need to plan to update to the new versions available in the STS release cycle every six months until version 3.5 is released. These updates are expected to be simple and backwards compatible.
A user is a person (or group of persons) who has authenticated itself by providing the registration data you requested. Normally, you create user accounts in order to grant access to exclusive parts of your site or allow your visitors to post their content.
In some cases it may not be possible to use the Extension Manager: Update method to update your site. One reason for this might be that you are using a non-standard distribution (for example, a distribution with a different default language installed). Another reason might be that your don't have a reliable enough internet connection to support automatic installation.