This explains how to login into the backend administrators part of Joomla!
See the instructions for logging in for Front End access if you have it.
To login to the 'backend' administrators area for Joomla!
After you login, a screen called the control panel will be displayed.
The Control Panel provides access to the main Joomla! functions and features.
Depending on your level of access, you will have access the Joomla! features that you need to manage your content.

There are areas of the site you may have access to that you might not need, but are necessary for the functioning of your site. Significant changes can be made and if used incorrectly, your website may fail to function such as:
So only go into these if you need to for your site.
Certain parts of your site will be restricted to the site administrator. This is to safeguard your site, as changing any of these elements could seriously compromise your site:
Click on the logout button found at the top right hand corner of the administration screen.