In Joomla! there is a default template, but you can assign other templates to specific "pages" that are defined by menu links. This technique can be used to format selected pages with different colors or graphics.
To assign a template to a page, you must first make sure that there is a direct menu link to the page.
- Go to Extensions>>Template Manager
- Select the Template and click the edit icon (or click the template name)
- In the left column, change "None" to "Select from List."
- Select the links you want to apply the template to.
- Save
Note that you cannot assign the default template to individual pages.
The templating system uses the ItemID to determine which template to show. ItemIDs are created when you create a menu link. This is why only menu items are shown in the list of pages to which you can assign templates.