Override Joomla 1.5 Global Meta Description
In Joomla 1.5 you have no control over meta description and meta keywords for most components.
Here is a short list of some of the components in question:
Contacts
Category Blogs
Section Blogs
Web Links
Home Page
DT Register
J Events
Chrono Forms
VirtueMart
On the whole it is just the first/front page of these components that you have no control of the metas.
Here is a work around that enables you to set the metas you want on any page that has a menu link.
This will involve editing you templates index.php file. You should do this via ftp (file transfer protocol) or similar server file editing software. You might be able to do this via your Joomla administrator area using the template manager function.
Some Joomla 1.5 templates are built on a framework so the main index.php file within your active template folder might not be the file you need to edit, you will need to track down the file that has this tag in it '<jdoc:include type="head" />'. If you are struggling to find the file, download it to your computer and search the folder for the tag in question.
When you have found the file with the include head tag, past this code into the file directly below the '<jdoc:include type="head" />' tag.